In what time will a train 100 m long cross an electric pole, it its speed be 144 km/hr?  Choose the correct choice.
A) 2.5 sec B) 2.7 sec C) 3.5 sec D) 2.9 sec E) 9.5 sec
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.   2.5 secnswer: 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?