Multiple choice

A train can cross a man running in the same direction in 10 seconds. If the speed of the man is 5 m/s and the length of the train is 200 m, then find the speed (in m/s) of the train?

  1. 25

  2. 30

  3. 35

  4. 40

  5. 45
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A Correct answer
Explanation

Relative speed of train with respect to man = (speed of train - 5) m/s. Distance covered = length of train = 200 m. Time = 10 seconds. So 200/(speed - 5) = 10, which gives speed - 5 = 20, therefore train speed = 25 m/s.

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