unit rate

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Marathon wheelchair division is 1hr 18min.and 27sec.
Marathon is 26.2 miles long. What is the average speed of the winner in the wheelchair division? round to the nearest hundred
help I don't get it.

  • unit rate -

    time = 1 : 18 : 27
    = 1 hr + 18/60 hrs + 27/3600 hrs
    = 1.3075 hrs

    speed = 26.5/1.3075 mph
    = 20.26768 mph

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