Civil Service Exam Reviewer · Averages · hard
A bus travels 80 km at 80 km/h, then 80 km at 60 km/h, then 60 km at 60 km/h. What is its average speed for the whole trip?
- 66.67 km/h
- 73.33 km/h
- 66 km/h
- 68 km/h
Answer
C. 66 km/h
Solution
Total distance = 220 km; total time = 80/80 + 80/60 + 60/60 = 3.3333 h. Average = 66 km/h.
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