a train running at the speed of 142 km / hr crosses a pole in 12 seconds . find the length of the train .
"speed = 162 * ( 5 / 18 ) m / sec = 45 m / sec length of train ( distance ) = speed * time 45 * 12 = 540 meter answer : a"
multiply(divide(multiply(142, const_1000), const_3600), 12)