the worth of a train is 50 cm which is going in the speed of 20 m per second and the another plane is also 50m with and going in the speed of 20 m per second how many second they will cross each other
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total distance to b crossed=50+50=100m
relative speed of one train with respect to other=20+20=40m/s
so time taken to cross=100/40=2.5s
relative speed of one train with respect to other=20+20=40m/s
so time taken to cross=100/40=2.5s
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