Rain x starts from a place at a speed of 50 kmph. after one hour another train y starts from the same place at the speed 70 km/hr. after how much time will y cross after starting of train x?
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the relative velocity of train y is 70-50=20kmph.
because the x train started 1hr before y,so it will be ahead of a distance 50km.
now to cover a distance of 50km with speed 20kmph,time will be 50/20=2.5hr
because the x train started 1hr before y,so it will be ahead of a distance 50km.
now to cover a distance of 50km with speed 20kmph,time will be 50/20=2.5hr
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