A 130m long train crosses a bridge in 30 seconds at 45 kmph. the length of the bridge is
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time required to cross the bridge is 30 sec
speed of any point on the train is 45 kmph i.e
12.5 m/s
length of the bridge shall be the product of speed of train and the time required to cross the bridge
L=12.5 × 30 = 375m or 0.375 km
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