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In what time will a train 100 meters long cross an electric pole, if its speed is 144 km/hr

A. 5 seconds

B. 4.5 seconds

C. 3 seconds

D. 2.5 seconds

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Correct Answer : D.


First convert speed into m/sec
Speed = 144*(5/18) = 40 m/sec
Time = Distance/speed
= 100/40 = 2.5 seconds

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