Civil Service Exam Reviewer · Averages · hard
A bus travels 20 km at 70 km/h, then 60 km at 40 km/h, then 20 km at 50 km/h. What is its average speed for the whole trip?
- 53.33 km/h
- 33.33 km/h
- 47.75 km/h
- 45.75 km/h
Answer
D. 45.75 km/h
Solution
Total distance = 100 km; total time = 20/70 + 60/40 + 20/50 = 2.1857 h. Average = 45.75 km/h.
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