Two trains 120 m and 80 m in length are running in opposite directions with velocities 42 km per hour and 30 km per hour, in what time will they completely cross each other.
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Suppose the one train is at rest then the relative velocity of other train with respect to this train will be= sum of velocities of the two trains that is 42+30=72km/hr or 20m/s .Distance that it will have to cover to cross the other train completely=sum of the lengths of the two trains that is 120+80=200m. Time required=distance/speed(relative speed) =200/20=10sec.
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