in what time will a train 100 metres long cross an electic pole, if its speed be 144 km / hr?	Pick one
A) 2.5 sec B) 4.25 sec C) 5 sec D) 12.5 sec E) none
<gadget id="calculator">10 / 36</gadget>
<output>5/18 = around 0.277778</output>

<gadget id="calculator">144 * (5/18)</gadget>
<output>40</output>

<gadget id="calculator">100 / 40</gadget>
<output>5/2 = around 2.5</output>

<result>A</result>
in what time will a train 100 metres long cross an electic pole, if its speed be 144 km / hr?
divide(100, multiply(144, const_0_2778))
"sol . speed = [ 144 x 5 / 18 ] m / sec = 40 m / sec . time taken = ( 100 / 40 ) sec = 2.5 sec . answer a"