The distance from Chandigarh to Amritsar is covered in 4.5 hours at a speed of 50 km/hr. By how much should the speed (in km/hr) be increased to save 30 minutes of travel time?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is Option 2 i.e. 6.25.
Distance = speed × time = 50 × 4.5 = 225 km
New time = 4.5 − 0.5 = 4 hours
New speed = distance / new time = 225 / 4 = 56.25 km/hr
Increase in speed = 56.25 − 50 = 6.25 km/hr