Civil Service Exam Reviewer · Averages · hard
A bus travels 40 km at 70 km/h, then 20 km at 80 km/h, then 60 km at 60 km/h. What is its average speed for the whole trip?
- 65.88 km/h
- 70 km/h
- 40 km/h
- 67.88 km/h
Answer
A. 65.88 km/h
Solution
Total distance = 120 km; total time = 40/70 + 20/80 + 60/60 = 1.8214 h. Average = 65.88 km/h.
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