Two trains, A and B, start from the same point at the same time and travel in opposite directions. Train A travels at a speed of 60 km/h and Train B travels at a speed of 80 km/h. After how many hours will they be 420 km apart?
ATQ, Relative speed = 60 km/h + 80 km/h = 140 km/h Time = Distance / Relative speed Time = 420 km / 140 km/h = 3 hours
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