Question

A train is 100m long and is moving with a uniform velocity of 45 km/hr. What is the time taken by it to cross a bridge 1 km long?

Answer 1

It is said that the train crossed the bridge when the final tip of the train reaches the end of the bridge. So,the train should cross 1100m to cross the bridge.
Time = distance / speed
= 1100/12.5
= 88
the train will take 88 secs to cross the bridge