A 225 m long train is running at a speed of 30 km/hour

A 225 m long train is running at a speed of 30 km/hour. How much time does it take to cross a man running at 3 km/hour in the same direction?

  1. 40 seconds
  2. 30 seconds
  3. 25 seconds
  4. 15 seconds

Answer

Since the train and man are running in the same direction, the relative speed of train w.r.t. man is

Speed = 30 - 3 = 27 km/hr = 7.5 m/s

Distance = 225 m

Time = Distance / Speed = 225/7.5

Time taken by train = 30 seconds

The correct option is B.