Ravi decided to cover a distance of 24 km in 2 hours 24 minutes. Further he decided to cover the initial one-third of the total distance at 8 km/hr and the remaining at some different speed. What is the speed (in km/hr) of Ravi after one-third distance is covered?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 11.
Total distance = 24 km
Distance for first one-third = 24 / 3 = 8 km
Time for first part = Distance / Speed = 8 / 8 = 1 hr
Remaining distance = 24 - 8 = 16 km
Total time = 2 hr 24 min = 2 + 24/60 = 12/5 hr
Time left for remaining 16 km = 12/5 - 1 = 7/5 hr
Speed for remaining = Distance / Time = 16 / (7/5) = 80 / 7 = 11 km/hr