Question
A person travels one-third of a journey at 30 km/h and the remaining two-thirds at 60 km/h. What is the average speed?
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Correct Answer: D. 45 km/h
Explanation:
Let total distance be 3d; time is d/30 + 2d/60 = d/15.
Average speed is 3d ÷ (d/15) = 45 km/h.
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