A train covers a distance of 12 km in 10 min. If it takes 12 sec to pass a telegraph post, then the length of the train is? Options:
A) 178 m B) 240 m C) 120 m D) 168 m E) 178 m
Speed = (12/10 * 60) km/hr = (72 * 5/18) m/sec   = 20 m/sec.   Length of the train = 20 * 12= 
<gadget id="calculator">20 * 12</gadget>
<output>240</output>
240 m.   Answer: 240 m
<result>B</result>
A train covers a distance of 12 km in 10 min. If it takes 12 sec to pass a telegraph post, then the length of the train is?