Question

two trains each 100m long ,oving in opposite directions ,cross each other in 8sec .if one is moving twice as fast than other ,then the speed of the faster train is?

Joshi sir comment

Crossing means to cover the length of both the trains

so according to the given conditions 2v+v = (100+100)/8

or 3v = 25 or v = 25/3

so speed of faster train = 50/3 m/s

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