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Matter In Our Surroundings

Question
CBSEENSC9005715
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A train 40 m long passes over a bridge 200 m long at a speed of 36 km/h. How long will it take to pass completely over the bridge?

Solution

Length of the train = 40 m = 0.04 km
Length of the bridge = 200 m = 0.2 km
Speed of the train = 36 km/hr

The total time taken by the train to completely pass over the bridge is given by time for the front of the train to travel 200 m at 36 km/hr + time for the back of train to travel 40 m at a speed of 36 km/hr. 

Therefore, 

Total time taken = s1v+s2v 

                         = 1vs1 + s2= 0.236+0.0436= 0.005 + 0.001= 0.006 hrs= 24 sec

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