Question

Man sitting in a train moving at 50kmph observes that a goods train

Answer 1

Rate of the travelling goods train = 50km/hr (Given)Time taken by the goods train to travel opposite = 9sec (Given)Length of the goods train = 187.5cm (Given)Let the speed of the goods train be = x km/hrThen, the relative speed = 187.5/9Thus, using the equation - (50+x) × (5/18) = 187.5/9On solving - =  x = 25 km/hr

Hence, the speed of the train is 25 km/hr