In what time will a train 120 metres long cross an electric pole, if its speed be 72 km/hr?  Choose the correct choice from the following answers:
A) 7 sec B) 6 sec C) 8 sec D) 9 sec E) 5 sec
Solution   Speed	= (72 x 5 /18) m/sec   = 20 m / sec   Time taken	= (120 /20)= 
<gadget id="calculator">(120 /20)</gadget>
<output>6</output>
6 sec.   Answer 6 sec
<result>B</result>
In what time will a train 120 metres long cross an electric pole, if its speed be 72 km/hr?