A train covers a distance of 12 km in 10 min. If it takes 6 sec to pass a telegraph post, then the length of the train is?  Select:	A) 999	B) 279	C) 120metre	D) 99	E) 21
Speed = (12/10 * 60) km/hr = (72 * 5/18) m/sec = 20 m/sec.   Length of the train = 20 * 6= 
<gadget id="calculator">20 * 6</gadget>
<output>120</output>
120 m.   Answer: 120metre
<result>C</result>
A train covers a distance of 12 km in 10 min. If it takes 6 sec to pass a telegraph post, then the length of the train is?