问答题A car traveled from A to B in 30 minutes. The first half of the trip was covered at 50 mph, and the second half at 60 mph. What was the average speed?400/11 - 500/11 - 600/11 - 700/11

题目
问答题
A car traveled from A to B in 30 minutes. The first half of the trip was covered at 50 mph, and the second half at 60 mph. What was the average speed?400/11 - 500/11 - 600/11 - 700/11
相似考题

1.The last train arrives at half past eleven at night. 的中文翻译为:末班车晚上11点半到站。()此题为判断题(对，错)。

2.b)main(){union{ /*定义一个联合*/int i;struct{ /*在联合中定义一个结构*/char first;char second;}half;}number;number.i=0x4241; /*联合成员赋值*/printf("%c%c\n", number.half.first,mumber.half.second);number.half.first='a'; /*联合中结构成员赋值*/number.half.second='b';printf("%x\n", number.i);getch();}

3.Nexus7000configtNexus700（config）interfaceethernet2/11Nexus700（config-if）switchportmodeprivate-vlanhostNexus700（config-if）switchportprivate-vlanhost-association1450Nexus700（config-if）exitNexus700（config）Whatwillthiscommandsequenceachieve？（）A.associateinterfaceE2/11tocommunityVLANs14and50B.associateinterfaceE2/11tosecondaryVLANs14and50C.associateinterfaceE2/11toprimaryVLAN50andsecondaryVLAN14D.associateinterfaceE2/11toprimaryVLAN14andsecondaryVLAN50

4.The bottom half shows ______ this money came from.A where ;B what ;C why

更多“问答题A car traveled from A to B in 30 minutes. The first half of the trip was covered at 50 mph, and the second half at 60 mph. What was the average speed?400/11 - 500/11 - 600/11 - 700/11”相关问题

  • 第1题：

    甲企业在2006年11月8日销售商品100件，增值税专用发票上注明的价款为10 000元，增值税额为1 700元。企业为了及早收回货款而在合同中规定的现金折扣条件为：2/10、1/20、N/30。假定计算现金折扣时不考虑增值税。如买方在2006年11月17日付清货款，该企业实际收款金额应为（）元。

    A.11 466

    B.11 500

    C.11 583

    D.11 700


    正确答案：B
     应收账款为11 700元，10天内付清，应该给予的现金折扣为2%。由于计算现金折扣时不考虑增值税，实际收回的金额为1 700+10 000×98%＝11 500（元）。

  • 第2题：

    某交易者7月30日买人1手11月份小麦合约，价格为7.6美元/蒲式耳，同时卖出1手11月份玉米合约，价格为2.45美元/蒲式耳，9月30日，该交易者卖出1手11月份小麦合约，价格为7.45美元/蒲式耳，同时买入1手11月份玉米合约，价格为2.20美元/蒲式耳，1手：5000蒲式耳，请计算套利盈亏（）。

    • A、获利700美元
    • B、亏损700美元
    • C、获利500美元
    • D、亏损500美元

    正确答案:C

  • 第3题：

    “Shipment is to be made in the second half of a month.” means shipment to be made from （）.

    • A、the 1st to the 10th
    • B、the 11th to the 20th
    • C、the 1st to the 15th
    • D、the 16th to the last day of such month

    正确答案:D

  • 第4题：

    11. abstract class Vehicle { public int speed（） { return 0； } }  12. class Car extends Vehicle { public int speed（） { return 60； } }  13. class RaceCar extends Car { public int speed（） { return 150； }}  ......  21. RaceCar racer = new RaceCar（）；  22. Car car = new RaceCar（）；  23. Vehicle vehicle = new RaceCar（）；  24. System.out.println（racer.speed（） + “， „ + car.speed（）  25. + “， “+ vehicle.speed（））；  What is the result？（） 

    • A、 0， 0，0
    • B、 150， 60， 0
    • C、 Compilation fails.
    • D、 150， 150， 150
    • E、 An exception is thrown at runtime.

    正确答案:D

  • 第5题：

    问答题
    What is the number that is one half of one quarter of one tenth of 400?

    正确答案： 5
    解析：
    400的十分之一是40，40的四分之一是10，10的二分之一是5。

  • 第6题：

    单选题
    If the average of 8 and x is 10 and the average of 7 and y is 11, what is the average of x and y?
    A

    9.0

    B

    10.5

    C

    12.0

    D

    13.5

    E

    15.00


    正确答案： C
    解析：
    因为8和x的平均数为10，可得出(8+x)/2=10，x=12。又因为7和y的平均数为11，所以可得出7 + y = 22，y=15，所以x和y的平均值为(x+y)/2=(12+15)/2= 27/2=13.5。

  • 第7题：

    问答题
    Over the course of a year, a certain house appreciated in value by 10 percent while the house next door decreased in value by 10 percent as a result of foundation damage. At the end of the year, the reduced price of the second house was what percentage of the increased price of the first house?　　(1) The amount by which the first house increased in value was half as much as the amount by which the second house decreased in value.　　(2) At the end of the year, the second house was worth $70,000 more than the first house.

    正确答案： A
    解析：
    根据条件1可知，价格增长了64%；根据条件2无法计算，故本题应选A项。

  • 第8题：

    单选题
    An over-speed trip serves to （）
    A

    stop the engine by cutting off the cooling water supply

    B

    stop the engine by closing the air intake

    C

    slow the engine but not stop it

    D

    slow the engine to half of normal load


    正确答案： A
    解析： 暂无解析

  • 第9题：

    单选题
    Nexus7000# config t  Nexus700（config）# interface ethernet 2/11  Nexus700（config-if）# switchport mode private-vlan host  Nexus700（config-if）# switchport private-vlan host-association 14 50  Nexus700（config-if）# exit   Nexus700（config）#  What will this command sequence achieve？（）
    A

     associate interface E2/11 to community VLANs 14 and 50

    B

     associate interface E2/11 to secondary VLANs 14 and 50

    C

     associate interface E2/11 to primary VLAN 50 and secondary VLAN 14

    D

     associate interface E2/11 to primary VLAN 14 and secondary VLAN 50


    正确答案： B
    解析： 暂无解析

  • 第10题：

    单选题
    At 1923，you increase speed to make good 9.2 mph. What is the first gage you will pass after your speed change?（）
    A

    Cottonwood Point

    B

    Tiptonville

    C

    Fulton

    D

    New Madrid


    正确答案： B
    解析： 暂无解析

  • 第11题：

    判断题
    The last train arrives at half past eleven at night. 的中文翻译为：末班车晚上 11 点半到站。
    A

    对

    B

    错


    正确答案： 错
    解析： 暂无解析

  • 第12题：

    单选题
    What time was the man’s appointment?
    A

    10:30.

    B

    11:00.

    C

    11:40.


    正确答案： B
    解析： 录音中男士第一句话提到Hello, I’m having an appointment to see the dentist at 11.，因此答案为B项。
    【录音原文】
    　　M: Hello, I have an appointment to see the dentist at 11:00.
    　　W: Oh, dear. You are very late, that was over half an hour ago
    　　M: What’s time is it now?
    　　W: It’s 11:40.

  • 第13题：

    The last train arrives at half past eleven at night. 的中文翻译为：末班车晚上 11 点半到站。


    正确答案:正确

  • 第14题：

    下列哪种等径支柱用于锚柱（）。

    • A、80/11+3Φ400
    • B、100/11+3Φ400
    • C、60/9+3Φ400
    • D、80/9+3Φ400

    正确答案:B,D

  • 第15题：

    Nexus7000# config t  Nexus700（config）# interface ethernet 2/11  Nexus700（config-if）# switchport mode private-vlan host  Nexus700（config-if）# switchport private-vlan host-association 14 50  Nexus700（config-if）# exit   Nexus700（config）#  What will this command sequence achieve？（）

    • A、 associate interface E2/11 to community VLANs 14 and 50
    • B、 associate interface E2/11 to secondary VLANs 14 and 50
    • C、 associate interface E2/11 to primary VLAN 50 and secondary VLAN 14
    • D、 associate interface E2/11 to primary VLAN 14 and secondary VLAN 50

    正确答案:D

  • 第16题：

    排烟消防车型号为4-72-11N08C的离心风机的排烟管直径为（　）。

    • A、400mm 
    • B、500mm 
    • C、600mm 
    • D、700mm

    正确答案:D

  • 第17题：

    问答题
    A man jogs at 6 mph over a certain distance and walks back over the same route at 4 mph. What is his average speed for the journey?

    正确答案： 4.8 mph
    解析：
    mph英里/小时。设单程距离为x，平均速度=总距离/总时间=2x/(x/6+x/4)=4.8

  • 第18题：

    单选题
    If the average of x and y is 11/2 and the average of 1/x and 1/y is 11/24, then xy =______.
    A

    4

    B

    6

    C

    11

    D

    12

    E

    14


    正确答案： C
    解析：
    Since the average of x and y is 11/2, then, (x + y)/2 = 11/2 or x + y = 11. If the average of 1/x and 1/y is 11/24, then (1/2)(1/x + 1/y) = 11/24 or 1/x + 1/y = 11/12. Since 1/x + 1/y = (x + y)/xy and x + y = 11 then 11/xy = 11/12, so xy=12.

  • 第19题：

    单选题
    A

    By the end of this century.

    B

    By the first half of this century.

    C

    By the second half of this century.

    D

    In the middle of this century.


    正确答案： C
    解析：
    [考点]细节题。录音提到，大多数科学家认为最大化的警告将会在本世纪后50年产生。
    【听力原文】
    　　With the development of science, scientists have discovered more about the world. Scientists say world coastal areas must prepare now for [33] a rise in sea levels. No matter what action is taken, scientists say there are already enough [34] greenhouse gases in the atmosphere to cause a major warning. As a result, scientists and government officials are focusing on how society might adapt to rising sea levels, changing agricultural zones, changing climates and other problems.
    　　Already, state and local governments along the coast of the United States are starting to plan for a possible long-term rise in the sea level, and a few have taken action to cope with it. Agricultural researchers are developing [35] heat-resistant and draught-resistant crops that might replace traditional crops if the climate changes. How long it will take for maximum warming to be reached is uncertain because the oceans slow such warming. Most scientists expect the maximum warming to take place [36] by the second half of this century.
    　　If levels of greenhouse gases in the atmosphere double, sea levels will rise; estimates of the average rise are from 1.5 feet to 6.5 feet. Some leading experts expect a rise of 1 meter, a little more than three feet.
    Questions 33 to36 are based on the passage you have just heard.
    33. What must world coastal areas prepare for according to scientists’ opinion?
    34. According to the passage, what has caused the rise in sea levels?
    35. What are the agricultural researchers developing?
    36. When will the maximum warming take place?

  • 第20题：

    问答题
    An aircraft flew from A to B at an average speed of 230 mph. It returned from B to A at an average speed of 300 mph. What was its average speed for the two journeys?

    正确答案： 260 mpf
    解析：
    设飞机从A到B耗时a小时，从B到A耗时b小时，那么可得出230a=300b；飞机飞行整个路程中所用的平均速度则为300b/(a+b)；将两个方程式合并，便可得出平均速度约为260.3 mpf，四舍五入后取结果260mpf。

  • 第21题：

    单选题
    What can we get from the passage?
    A

    Dave skated a total of 4,830 kilometers across Australia

    B

    Dave spent 5 months skating from Perth to Brisbane

    C

    Dave was the first person to skateboard across the US

    D

    Dave traveled at the speed of 600 kilometers a week


    正确答案： B
    解析：
    由第一段中的“Dave’s journey started in Perth and ended in Brisbane, traveling about 60 kilometers a day. It took him five months and l3 pairs of shoes”可知，B项正确，意思是“Dave从Perth滑到Brisbane用了五个月时间”。

  • 第22题：

    问答题
    A car traveled from A to B in 30 minutes. The first half of the trip was covered at 50 mph, and the second half at 60 mph. What was the average speed?400/11 - 500/11 - 600/11 - 700/11

    正确答案： 600/11 miles
    解析：
    这是一道计算题，我们设平均时速为X，则0.25X/50+0.25X/60=0.5，进而可得X=600/11，因此该选600/11。

  • 第23题：

    问答题
    Britain’s car industry may be showing down but British engineers can still build the world’s fastest car. (1)____(construct) work begins today on a car that engineers hope will break the land speed record (2)____ more than 200 mph.　　The car, Bloodhound, is designed to travel faster than 1,000 mph(1,600km/h)—far in (3) ex____ of the speed of sound and the equivalent of crossing four football pitches every second. The record of 763 mph was (4) s____ in 1997 by the Royal Air Force pilot Andy Green, who will also drive Bloodhound.　　The time trial is (5) sch____ for 2011 and will take place in desert in the Northern Cape of South Africa.　　The car’s pencil-shape shell is made from (6)____(forge) aerospace-grade aluminum.　　Three engines lie under the bonnet: a 400 kg Euro-fighter Typhoon jet engine, a rocket and a third engine to pump fuel through to the rocket. This combination should produce 135,000 horsepower—(7) eq____ to the power of 180 Formula One cars.　　Wing Commander Green, 46, will lie feet—first in Bloodhound. As the car (8)____ (acceleration) to 1,050 mph in 40 seconds he will experience a force of 2.5 G, or about twice his body weight, As he decelerates and experiences forces of up to 3G, the blood will drain from his head to his feet and he could black out. He will prepare (9)____ the trial by flying upside down in a stunt aircraft. “A huge advantage is (10)____ I’ve got 20 years’ experience of flying fast jets,” he said.

    正确答案： 1.construction 名词作主语。
    2.by by可表速率。
    3.excess in excess of超过…。
    4.set set a record创下纪录。
    5.scheduled be scheduled for定于…(时间)。
    6.forged forged锻造的。aerospace-grade航空级。
    7.equivalent be equivalent to与…相等。后半句省略了which is。
    8.accelerates accelerate to加速到…。主句是将来时,as引导的从句用一般现在时。
    9.for prepare for为…作准备。
    10.that 此句是表语从句,要用that引导。
    解析： 暂无解析

  • 第24题：

    单选题
    “Shipment is to be made in the second half of a month.” means shipment to be made from （）.
    A

    the 1st to the 10th

    B

    the 11th to the 20th

    C

    the 1st to the 15th

    D

    the 16th to the last day of such month


    正确答案： B
    解析： 暂无解析

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