Multiple choice

A train 100 meters long takes 6 seconds to cross a man walking at 5km/h in a direction opposite to that of the train. The speed of the train is

  1. 50 km/h

  2. 55 km /h

  3. 57 km/h

  4. 60 km/h
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The relative speed is (v + 5) km/h. Convert 100 meters to 0.1 km and 6 seconds to 6/3600 hours. Relative speed = distance/time = 0.1 / (6/3600) = 0.1 * 600 = 60 km/h. Since the train and man move in opposite directions, the train speed is 60 - 5 = 55 km/h.

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