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A runner wants to run 11.6 km. She knows that her running pace is 8.1 miles per hour. How many minutes must she run?

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2 answers
  1. speed = dist/time (as in miles/hr)
    The sneaky part here is that everything is in different units. You want to end up with minutes. So, convert everything to miles and minutes

    11.6 km * mi/1.6km = 7.2 mi

    so, plug and chug:
    speed = dist/time
    8.1 = 7.2/t
    t = 8/9 hr

    But we want minutes = 66*8/9 = 53 1/3 min.

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  2. oops, that's 60*8/9

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