Civil Service Exam Reviewer · Averages · hard
A bus travels 80 km at 60 km/h, then 20 km at 50 km/h, then 20 km at 80 km/h. What is its average speed for the whole trip?
- 63.33 km/h
- 40 km/h
- 60.5 km/h
- 62.5 km/h
Answer
C. 60.5 km/h
Solution
Total distance = 120 km; total time = 80/60 + 20/50 + 20/80 = 1.9833 h. Average = 60.5 km/h.
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