Question
A car covers its journey at the speed of 80 km/hr in 10
hours. If the same distance is to be covered in 4 hours, by how much the speed of the car will have to increase?Solution
Initial speed = 80 km/hr. Total distance = 80 ×  10 = 800 km New speed = 800/4 = 200 km/hr. Increase in speed = 200 - 80 = 120 km/hr.
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