In what time will a train 20 m long cross an electric pole, it its speed be 144 km/hr?  Choose the correct option
A) 2.5 sec B) 2.8 sec C) 0.5 sec D) 2.3 sec E) 1.5 sec
Speed = 144 * 5/18= 
<gadget id="calculator">144 * 5/18</gadget>
<output>40</output>
40 m/sec   Time taken= 20/40= 
<gadget id="calculator">20/40</gadget>
<output>1/2 = around 0.5</output>
0.5 sec.   Answer:0.5 sec
<result>C</result>
In what time will a train 20 m long cross an electric pole, it its speed be 144 km/hr?