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## Main Question or Discussion Point

Two trains having lengths of 120 m and 100 m are running in the opposite directions with velocities 40 km/h and 50 km/h . In what time they will completely cross each other? In the solution it's given that

Time taken by the two trains to cross each other = sum of length of trains/relative speed of trains

I fail to understand the above formula . How are the lengths of trains relevant?

Time taken by the two trains to cross each other = sum of length of trains/relative speed of trains

I fail to understand the above formula . How are the lengths of trains relevant?