A car travelling at an average speed of 72 km/hr takes 9 minutes to travel a certain distance. By how much should it increase its speed (in km/hr) to travel the same distance in 8 minutes?
Show answer & explanation
Correct answer: B
Explanation
the correct answer is option 2 i.e. 9
Distance travelled will be the same in both the cases
72 × 9/60 = x × 8/60
x = 81
Increase = 81 - 72 = 9 km/hr