1.

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

Answer»

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



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