A train 125 m long passes a man, running at 5 km/hr in the same direction in which the train is going, in 10 seconds. The speed of the train is: A. 45 km/hr B. 50 km/hr C. 54 km/hr D. 55 km/hr

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The relative velocity of train is (x-5) if x is real velocity. (x-5) *(1000/3600 )* 10 = 125 x = 50km/hr
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The required answer is option A. 45 km/hr
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