Question
A car covers equal distances at 40 km/h and 60 km/h. What is its average speed?
Select an option. Your answer will be checked instantly.
Correct Answer: C. 48 km/h
Explanation:
For equal distances, average speed is the harmonic mean 2ab/(a + b).
Thus, 2 × 40 × 60 ÷ 100 = 48 km/h.
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