A train covers a distance of 15 km in 10 min. If it takes 10 sec to pass a telegraph post, then the length of the train is?  Choose the correct choice:
A) 240m
B) 150 m
C) 120 m
D) 200 m
E) 165 m
Speed = (15/10 * 60) km/hr   = (90 * 5/18) m/sec   = 25 m/sec.   Length of the train   = 20 * 10= 
<gadget id="calculator">20 * 10</gadget>
<output>200</output>
200m.   Answer: 200 m
<result>D</result>
A train covers a distance of 15 km in 10 min. If it takes 10 sec to pass a telegraph post, then the length of the train is?