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A train 125 m long passes a man, running at 5km/hr in the same direction in which the train is going,in 10 seconds. The speed of the train is:A) 45km/hrB)50 km/hrC)54 km/hrD)55 km/hr |
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Answer» SPEED of the train relative to man : = (125/10) m/sec = (25/2) m/sec. Speed: =[(25/2) X (18/5)] km/hr = 45 km/hr. Let the speed of the train be 'S' km/hr. Then, relative speed : = (S - 5) km/hr. S - 5 = 45 S = 50 km/hr. Therefore The answer Is OPTION B |
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