In what time will a train 300 m long cross an electric pole, it its speed be 144 km/hr?  Choose the correct choice from the following:
A) 2.5 sec  B) 9.7 sec  C) 3.5 sec  D) 2.9 sec  E) 7.5 sec
Speed = 144 * 5/18= 
<gadget id="calculator">144 * 5/18</gadget>
<output>40</output>
40 m/sec   Time taken= 300/40= 
<gadget id="calculator">300/40</gadget>
<output>15/2 = around 7.5</output>
7.5 sec.   Answer: 7.5 sec
<result>E</result>
In what time will a train 300 m long cross an electric pole, it its speed be 144 km/hr?