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Two trains are moving in opposite directions at 70 km/hour and 110 kmph. Their lengths are 1.7km and 1.3 km respectively. The time taken by the slower train to cross the faster train in seconds is :
50sec
65sec
60sec
70sec
Relative speed =(110 + 70 )kmph = 180kmph =(180x5/18)m/sec = 50m/sec Distance covered = (1.3+1.7) = 3 km = 3000m Required time =(3000/50) = 60sec
By: bhavesh kumar singh ProfileResourcesReport error
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