a train running at the speed of 54 km / hr crosses a pole in 7 seconds . find the length of the train .
"explanation : speed = 54 * ( 5 / 18 ) m / sec = 15 m / sec length of train ( distance ) = speed * time = 15 * 7 = 105 meter option b"
multiply(divide(multiply(54, const_1000), const_3600), 7)