two trains 120 m and 80 m long are running in opposite direction with velocities 42 km/h and 30 km/h respectively.In what time they will completely cross each other?
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Explanation:
Since they were running in opposite direction their velocities must be added.
relative speed = 42+30 = 72
To cross each other they have to cover a distance of 120 + 80 meters i. e., 200 meters
we know d=st
200 = 72*T
T = 2.777 seconds is the time taken to cross each other
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