A train covers a distance of 12 km in 10 min. If it takes 9 sec to pass a telegraph post, then the length of the train is?
Pick:  A) 177 m  B) 189 m  C) 120 m  D) 178 m  E) 180 m
Speed = (12/10 * 60) km/hr = (72 * 5/18) m/sec   = 20 m/sec.   Length of the train = 20 * 9= 
<gadget id="calculator">20 * 9</gadget>
<output>180</output>
180 m.   Answer: 180 m
<result>E</result>
A train covers a distance of 12 km in 10 min. If it takes 9 sec to pass a telegraph post, then the length of the train is?