In what time will a train 100 metres long cross an electic pole, if its speed be 144 km/hr?	Options.
A) 2.5 sec B) 4.25 sec C) 5 sec D) 12.5 sec E) None
Sol.   Speed = [144x5/18] m/sec = 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 metres long cross an electic pole, if its speed be 144 km/hr?