The distance between the two towns is covered in 7 hours at a speed of 50km/h. By how much should the speed (in km/h) be increased so that 2 hours of traveling time will be saved?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 20.
Given:
Speed = 50 Km/h
Time = 7 hours
Explanation:
If we have to save 2 hours, we will have to cover the entire journey in 5 hours.
The ratio of time becomes 5 : 7
Then, the ratio of speed becomes 7 : 5
Thus, the speed must be (7/5) × 50 = 70 km/h
Hence, Speed should be increased by 20 km/h.