a train running at a speed of 36 kmph crosses an electric pole in 12 seconds. in how much time will it cross a 390 m long platform? Options.
A) 19 B) 27 C) 51 D) 47 E) 28
<gadget id="calculator">10 / 36</gadget>
<output>5/18 = around 0.277778</output>

<gadget id="calculator">(5/18) * 36</gadget>
<output>10</output>

<gadget id="calculator">10 * 12</gadget>
<output>120</output>

<gadget id="calculator">390 + 120</gadget>
<output>510</output>

<gadget id="calculator">510 / 10</gadget>
<output>51</output>

<result>C</result>
a train running at a speed of 36 kmph crosses an electric pole in 12 seconds. in how much time will it cross a 390 m long platform?
divide(add(390, multiply(multiply(const_0_2778, 36), 12)), multiply(const_0_2778, 36))
"let the length of the train be x m . when a train crosses an electric pole , the distance covered is its own length . so , x = 12 * 36 * 5 / 18 m = 120 m . time taken to cross the platform = ( 120 + 390 ) / 36 * 5 / 18 = 51 min . answer : c"