SOLUTION: A reconnaissance plane flies 600 km away from its base at 180 km/h, then flies back to its base at 420 km/h. What is its average speed?
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Question 393977: A reconnaissance plane flies 600 km away from its base at 180 km/h, then flies back to its base at 420 km/h. What is its average speed?
Answer by robertb(5830) (Show Source): You can put this solution on YOUR website!
Use the harmonic means of the two rates:
km/h, the average speed of the plane.
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