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A 150 m long train is moving with a constant velocity of 45 kilometre/hour. The time taken by this train to cross a bridge of length 850 m is:
A 150 m long train is moving with a constant velocity of 45 kilometre/hour. The time taken by this train to cross a bridge of length 850 m is:
Total distance to cross = train length + bridge length = 150+850 = 1000 m. Speed = 45 km/hr = 12.5 m/s. Time = distance/speed = 1000/12.5 = 80 seconds.
Re-check your working by substituting the answer back into the original question.