A car taken 5 hours to cover a distance of 300 kms. How much should the speed in km/hour be maintained to cover the same distance in 4/5th of the previous time ?
Answer: D. 75 km/hour
1st case : Time taken by car to cover 300 km = 5 hours. Speed of the car = 300/5 = 60 km/hour.
2nd case : Time desired to cover the same distance of 300 km = 4 hours. Required speed = 300/4 = 75 km/hour.