Time taken by train of length l metres to pass a pole or a standing man or a signal post is equal to the time taken by the train to cover l metres.

Time taken by train of length 1 metres to pass a pole or a stationary object of length b metres is the time taken by the train to cover (1+b) metres.

If two trains of length a metres and n metres are moving in the same direction at u m/s and vm/s: then time taken by faster train to cross the slower train.

If two train of length a metres and b metres are moving in opposite direction at u m/s and v m/s: then time taken by trains to cross each other.

A train covers 85 m in passing a signal post. What is the length of the train?

A moving train crosses a man standing on a platform and a bridge 300 metres long in 10 seconds and 25 seconds respectively. What will be the time taken by the train to cross a platform 200 metres long?