A car covers a certain distance at a constant speed of 45 km/h in 4 hours. If the car moves at a speed of 40 km/h, how much more time (in minutes) will it take to cover the same distance?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is Option 4 i.e. 30.
Distance = 45 × 4 = 180 km
New time = 180 ÷ 40 = 4.5 hrs
Extra time = 4.5 − 4 = 0.5 hrs = 30 minutes