A train 125 m long passes a man, running at 20 km/hr in the same direction in which the train is going, in 10 seconds. The speed of the train is?
Choose the correct option.
A) 36 B) 50 C) 28 D) 26 E) 65
Speed of the train relative to man = (125/10) m/sec = (25/2) m/sec. [(25/2) * (18/5)] km/hr = 45 km/hr. Let the speed of the train be x km/hr. Then, relative speed = (x - 20) km/hr. x - 20 = 45 ==&gt; x = 65 km/hr   Answer: 65
<result>E</result>
A train 125 m long passes a man, running at 20 km/hr in the same direction in which the train is going, in 10 seconds. The speed of the train is?