alleryStart learning →A cyclist covers a route at 30 km/h and comes back at 60 km/h. What is the average speed over the whole trip?
A45 km/h
B40 km/h
C36 km/h
D42 km/h
Answer & Solution
Correct answer: B. 40 km/h
Equal distances call for the harmonic mean, so 2 x 30 x 60/90 gives 40 km/h.
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