Civil Service Exam Reviewer · Averages · hard
A bus travels 70 km at 60 km/h, then 70 km at 50 km/h, then 60 km at 60 km/h. What is its average speed for the whole trip?
- 56.67 km/h
- 66.67 km/h
- 58.07 km/h
- 56.07 km/h
Answer
D. 56.07 km/h
Solution
Total distance = 200 km; total time = 70/60 + 70/50 + 60/60 = 3.5667 h. Average = 56.07 km/h.
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