Civil Service Exam Reviewer · Averages · hard
A bus travels 70 km at 40 km/h, then 70 km at 50 km/h, then 30 km at 50 km/h. What is its average speed for the whole trip?
- 46.67 km/h
- 56.67 km/h
- 45.33 km/h
- 47.33 km/h
Answer
C. 45.33 km/h
Solution
Total distance = 170 km; total time = 70/40 + 70/50 + 30/50 = 3.75 h. Average = 45.33 km/h.
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