In what time will a train 100 m long cross an electric pole, it its speed be 144 km/hr?  Select the correct option.
A) 2.5sec	B) 4.25sec	C) 5sec	D) 12.5sec	E) 6sec
2.5secnswer: Option 2.5sec   Speed = 144 * 5/18= 
<gadget id="calculator">144 * 5/18</gadget>
<output>40</output>
40 m/sec   Time taken= 100/40= 
<gadget id="calculator">100/40</gadget>
<output>5/2 = around 2.5</output>
2.5 sec.
<result>A</result>
In what time will a train 100 m long cross an electric pole, it its speed be 144 km/hr?