A car can cover a distance of 144 km in 1.8 hours . In what time (in hours) will it cover double the distance when its speed in increased by 20%?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 3
Speed of the car = 144/1.8 = 80km/hr.
Speed increased by 20%,
New speed = 80 × 1.2 = 96km/hr.
New distance = 144 × 2 = 288 km.
Time taken = 288/96 = 3 hours.