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A cyclist bikes x distance at 10 miles per hour and returns over the same path at 8 miles per hour. What is the cyclist's average rate for the round trip in miles per hour? ( please help me ! )

  • math -

    let x=80, so
    =8.8889 mi/hour

  • math -

    I don't know why nancy picked 80 as a value for x, since it could be almost any value.

    Since the distance is the same for both rates, it the mean of 10 and 8.

    (10 + 8)/2 = 9

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