A car covers its journey at the speed of 80km/hr in 10hours. If the same distance is to be covered in 4 hours, by how much the speed of car will have to increase?
Initial speed = 80km/hrTotal distance = 80 * 10 = 800kmnew speed = 800/4 =200km/hrIncrease in speed = 200 - 80 = 120km/hr