how long does a train 125 m long running at the speed of 78 km / hr takes to cross a bridge 125 m length? Select:	A) 12.7 sec	B) 10.1 sec	C) 11.5 sec	D) 12.1 sec	E) 11.7 sec
<gadget id="calculator">125 + 125</gadget>
<output>250</output>

<gadget id="calculator">10 / 36</gadget>
<output>5/18 = around 0.277778</output>

<gadget id="calculator">78 * (5/18)</gadget>
<output>65/3 = around 21.666667</output>

<gadget id="calculator">250 / (65/3)</gadget>
<output>150/13 = around 11.538462</output>

<result>C</result>
how long does a train 125 m long running at the speed of 78 km / hr takes to cross a bridge 125 m length?
divide(add(125, 125), multiply(78, const_0_2778))
"speed = 78 * 5 / 18 = 21.7 m / sec total distance covered = 125 + 125 = 250 m . required time = 250 / 21.7 ' = 11.5 sec . answer : c"