Given: Distance = 540km, Speed of the slower car = 90km/hr, faster car take 1 hour less then slower car to cover the same distance. Formula: Distance = speed × time Calculation Time taken by slower car = Distance/speed ⇒ Time = 540/90 = 6hrs ∴ Fast car takes 5 hour to cover the distance ∴ Speed = 540/ 5 = 108 km/hr