two trains of lengths 280 metres and 320 metres move towards each other with speed of 45kms and 60kms per hour respectively. how long will it take to cross each other?
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length to cross = 280+320 = 600m
relative speed= 45+60 = 105 km/h
105km/h = 105 × 5/18 = 525/18 m/s
time to cross = 600/(525/18) = 600×18/525 = 144/7 sec = 20.57 second
relative speed= 45+60 = 105 km/h
105km/h = 105 × 5/18 = 525/18 m/s
time to cross = 600/(525/18) = 600×18/525 = 144/7 sec = 20.57 second
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