Civil Service Exam Reviewer · Averages · hard
A bus travels 50 km at 40 km/h, then 30 km at 50 km/h, then 70 km at 50 km/h. What is its average speed for the whole trip?
- 46.67 km/h
- 50 km/h
- 46.15 km/h
- 48.15 km/h
Answer
C. 46.15 km/h
Solution
Total distance = 150 km; total time = 50/40 + 30/50 + 70/50 = 3.25 h. Average = 46.15 km/h.
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