A train covers a distance of 10 km in 20 min. If it takes 6 sec to pass a telegraph post, then the length of the train is?  Choose one.
A) 50 B) 80 C) 120 D) 100 E) 40
Speed = (10/20 * 60) km/hr = (30 * 5/18) m/sec = 8.333333 m/sec.   Length of the train = 8.333333 * 6 = 50 m.50nswer: 50
<result>A</result>
A train covers a distance of 10 km in 20 min. If it takes 6 sec to pass a telegraph post, then the length of the train is?