A train covers a distance of 12 km in 10 min. If it takes 1 sec to pass a telegraph post, then the length of the train is? Choose the correct choice from the following choices
A) 10	B) 20	C) 30	D) 15	E) 45
Speed = (12/10 * 60) km/hr = (72 * 5/18) m/sec = 20 m/sec.   Length of the train = 20 * 1= 
<gadget id="calculator">20 * 1</gadget>
<output>20</output>
20 m.   Answer: Option 20
<result>B</result>
A train covers a distance of 12 km in 10 min. If it takes 1 sec to pass a telegraph post, then the length of the train is?