问答题Two cyclists are racing up a mountain at different constant rates. Cyclist A is now 50 meters ahead of cyclist B. How many minutes from now will cyclist A be 150 meters ahead of cyclist B?　　(1) 5 minutes ago, cyclist A was 200 meters behind cyclist B.　

A towing vessel 30 meters in length is pushing barges ahead. How many white masthead lights is the vessel REQUIRED to show at night?（）

Attention is called to the fact in many cases pipelines are not buried and charted depth may be decreased（）up to teo meters.

If two typists can type two pages in two minutes, how many typists will it take to type 18 pages in six minutes?

If 5 frogs catch 5 flies in 5 minutes, how many frogs are required to catch 50 flies in 50 minutes?

—How long is the bridge?—It’s ______.

Two cyclists are racing up a mountain at different constant rates. Cyclist A is now 50 meters ahead of cyclist B. How many minutes from now will cyclist A be 150 meters ahead of cyclist B?　　(1) 5 minutes ago, cyclist A was 200 meters behind cyclist B.　　(2) Cyclist A is moving 25% faster than cyclist B.

An employee at a company was given the task of making a large number of copies. He spent the first 45 minutes making copies at a constant rate on copier A, but copier A broke down before the task was completed. He then spent the next 30 minutes finishing the task on copier B, which also produced copies at a constant rate. How many total minutes would the task hare taken had copier A not broken down?　　(1) Copier A produced twice as many copies in its first 5 minutes of operation as copier B produced in its first 15 minutes.　　(2) Copier B produces 10 copies per minute.

What is the recommended distance between controller-based access points for support ofroaming？（）

How many minutes before midnight is it if one hour ago it was five times as many minutes past 9 pm？

---Dead slow ahead! ----Dead slow ahead! （）

—How did you play in the match?—Well, our team was ahead by two to zero during the first half, but we _____ in the last ten minutes.

How many token buckets are needed to support a multi-actions policer that meters conforming， exceedingand violating traffic？（）

Two men, starting at the same point, walk in opposite directions for 4 meters, turn left and walk another 3 meters. What is the distance between them?

How many minutes is it before 12 noon if 90 minutes ago it was four times as many minutes past 9 am?

Although the cyclist was unhurt, his bicycle was（）between the lorry and the wall.

Practice 2　　Until recently, scientists knew little about life in the deep sea, nor had they reason to believe that it was being threatened. Now, with the benefit of technology that allows for deeper exploration, researchers have uncovered a remarkable array of species inhabiting the ocean floor at depths of more than 660 feet, or about 200 meters. At the same time, however, technology has also enabled fishermen to reach far deeper than ever before, into areas where bottom trawls can destroy in minutes what has taken nature hundreds and in some cases thousands of years to build.　　Many of the world's coral species, for example, are found at depths of more than 200 meters. It is also estimated that roughly half of the world's highest seamounts - areas that rise from the ocean floor and are particularly rich in marine life - are also found in the deep ocean.　　These deep sea ecosystems provide shelter, spawning and breeding areas for fish and other creatures, as well as protection from strong currents and predators. Moreover, they are believed to harbor some of the most extensive reservoirs of life on earth, with estimates ranging from 500,000 to 100 million species inhabiting these largely unexplored and highly fragile ecosystems.

1000BaseT has a MAXIMUM run distance of:（）