Ramesh walks at 5 km/h for 6 km and 6 km/h for 8 km. What is his average speed?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 5.53 km/h.
Time for 1st part = 6/5 hours
Time for 2nd part = 8/6 = 4/3 hours
Total distance = 6 + 8 = 14 km
Total time = 6/5 + 4/3 = 38/15 hours
Average speed = 14 ÷ (38/15) = 14 × 15/38 = 105/19 ≈ 5.53 km/h