单选题A group of hikers is planning a trip that will take them up a mountain using one route and back down using another route. They plan to travel down the mountain at a rate of one and a half times the rate they will use on the way up, but the time each ro
题目
单选题A group of hikers is planning a trip that will take them up a mountain using one route and back down using another route. They plan to travel down the mountain at a rate of one and a half times the rate they will use on the way up, but the time each route will take is the same. If they will go up the mountain at a rate of 4 miles per day and it will take them two days, how many miles long is the route down the mountain?A
4B
6C
8D
12E
16
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参考答案和解析
正确答案：
B
解析：
下山的速度=1.5×4=6，所以下山的路程=6×2=12miles，故本题选D项。
下山的速度=1.5×4=6，所以下山的路程=6×2=12miles，故本题选D项。