Question

A train 150m long is running at 72km/hr. it crosses a bridge in 13 seconds. Find the length of the bridge

Answer 1

Speed of train in m/s=72*5/18=20m/s
Therefore length of bridge=20*13=260m
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Answer 2

Length of train = 150m
Speed of train = 72 Km/h
(in m/s) = 72 x 5/18 = 20 m/s
Time taken for train to cross bridge = 13 s

Speed = Distance Travelled / Time Taken
20 = Distance / 13
Distance = 13 x 20 = 260 m

This distance travelled by the train is = length of the train + length of the bridge
Therefore, Length of the bridge = 260 - Length of the train
Bridge = 260 - 150 = 110 m

Length of the bridge is therefore 110 m

Hope this is the required answer.
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