a train running at the speed of 72 km / hr crosses a pole in 9 seconds . find the length of the train ?
"speed = 72 * ( 5 / 18 ) m / sec = 20 m / sec length of train ( distance ) = speed * time ( 20 ) * 9 = 180 meter answer : e"
multiply(divide(multiply(72, const_1000), const_3600), 9)