A 150m long train is moving with a uniform velocity of 45km/h. The time taken by the train to cross a bridge of length 850m is

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56 sec

68 sec

80 sec

93 sec

answer is C.

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Detailed Solution

time taken=total length of train and bridgevelocity of trainvelocity of train =45×518m/sec (conversion) time taken = 150+85045×518 = 80 sec

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