The distance between two towns is covered in 7 hours and 30 minutes at the speed of 72 km/h. The time saved if the speed is increased by 25% is:
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 1 hour 30 minutes.
If the speed increases by 25%, then the new speed = 72 × 1.25 = 90 km/h
Distance = Speed × Time
For the same distance
⇒ 72 × 7.5 = 90 × T
⇒ T = 6 hours
Hence, the required time difference = 7.5 - 6 = 1.5 hours = 1 hour 30 minutes