A train covers a distance of 12 km in 10 min. If it takes 4 sec to pass a telegraph post, then the length of the train is?  Answers.
A) 20
B) 110
C) 120
D) 80
E) 60
Speed = (12/10 * 60) km/hr = (72 * 5/18) m/sec = 20 m/sec.   Length of the train = 20 * 4= 
<gadget id="calculator">20 * 4</gadget>
<output>80</output>
80 m.   Answer: Option 80
<result>D</result>
A train covers a distance of 12 km in 10 min. If it takes 4 sec to pass a telegraph post, then the length of the train is?