If a 250 m long train crosses a platform of same length as that of the train in 25 seconds, then the speed of the train is:

Answer: Option D

Speed of train
= $$\frac{\text{length of the train}+\text{length of platform}}{\text{Time}}$$
= $$\frac{250+250}{25}$$
= 20 m/sec
= 72 km/h