compare the rates of two trains , one travelling at 90 km / hr and other is at 50 m / s ?
speed of the 1 st train = 90 km / hr speed of the 2 nd train = 50 m / s = 50 * 18 / 5 = 180 km / hr ratio of the speeds of the train = 90 : 180 = 1 : 2 answer is b
divide(90, multiply(divide(50, const_1000), const_3600))