how much time does a train 160 metres long running at 72 km / hr take to pass a pole ?
"explanation : 72 km / hr = 72 * 5 / 18 = 20 m / s speed = distance / time ; v = d / t 20 = 160 / t t = 8 s answer : a"
multiply(divide(divide(160, const_1000), 72), const_3600)