In what time will a train 400 m long cross an electric pole, it its speed be 144 km/hr? Answers: A) 2.5 sec B) 12.9 sec C) 11.3 sec D) 21.9 sec E) 10.0 sec
Speed = 144 * 5/18= 
<gadget id="calculator">144 * 5/18</gadget>
<output>40</output>
40 m/sec   Time taken= 400/40= 
<gadget id="calculator">400/40</gadget>
<output>10</output>
10.0 sec.   Answer:10.0 sec
<result>E</result>
In what time will a train 400 m long cross an electric pole, it its speed be 144 km/hr?