a train covers a distance of 100 km in 1 hour . if its speed is decreased by 20 km / hr , the time taken by the car to cover the same distance will be ?
speed = 100 / 1 = 100 km / hr new speed = 100 - 20 = 80 km / hr time taken = 100 / 80 = 1 hr 15 min answer is b
divide(100, subtract(divide(100, 1), 20))