In what time will a train 140 m long cross an electric pole, it its speed be 144 km/hr?  Options: A) 3.5 sec B) 4.25 sec C) 5 sec D) 12.5 sec E) 6 sec
Speed = 144 * 5/18= 
<gadget id="calculator">144 * 5/18</gadget>
<output>40</output>
40 m/sec   Time taken= 140/40= 
<gadget id="calculator">140/40</gadget>
<output>7/2 = around 3.5</output>
3.5 sec.   3.5 secNSWER:3.5 sec
<result>A</result>
In what time will a train 140 m long cross an electric pole, it its speed be 144 km/hr?