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Question: the average speed of a greyhound bus from lansing to...

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The average speed of a Greyhound bus from Lansing to Detroit is 117.5 km/h. On the return trip from Detroit to Lansing the average speed is 53.2 km/h on the same road due to heavy traffic. What is the average speed of the bus for the round trip?

What is the arithmetic mean of the two speeds above?
What is the harmonic mean of the two speeds above?

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