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?
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.