Averages · Question 23 · Medium
A bus covers three equal distances at speeds of 30 km/h, 40 km/h and 60 km/h. What is its average speed for the whole journey?
- 43 1/3 km/h
- 40 km/h
- 45 km/h
- 42 km/h
Answer and explanation
Answer: B. 40 km/h
Explanation: For equal distances, average speed = 3/(1/30 + 1/40 + 1/60) = 3/(9/120) = 40 km/h.
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