Question

a train is 360 metre long is running at a speed of 45 kilometre per hour. In what time will it past the bridge of 140 long

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Answer 1

Since we are to find the the time when it will cross the bridge, we have to consider the end of the train. So when the train reaches the bridge, the end of the train is 360m away from the bridge and it has to cross the train length as well as the bridge length. That means it has to cross the distance of 140m+360m=500m.

Given,

Speed=45km/hr i.e 4500m/hr

now,

Time needed to travel 4500m= 1hr

Time needed to travel 1m= (1/4500)hr

Time needed to travel 500m= (1/4500*500)hr=1/9 hr= (1/9*60*60)s=400s=6mins40s.....

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