Two trains each of length 150 m are moving in opposite directions at 36 km/ h and 72km/ h respectively time taken by them just cross each other completely is?
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Answer: 10 sec
Explanation:
Length of first train= 150 metres
Length of second train = 150 metres
Velocity of first train = 36 km/h
= 36*5/18 = 10m/s
Velocity of second train = 72km/h
= 72*4/18 = 20m/s
Their relative speed = 10+20 = 30m/s
Time taken to cross each other = total distance /relative speed
= 150+150/30
= 10 seconds.
HOPE IT WILL HELP....
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