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15 September, 22:15

A runner wants to run 13.1 km. She knows that her running pace is 6.2 mi/h. How many minutes must she run? Hint: Use 6.2 mi/h as a conversion factor between distance and time.

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  1. 16 September, 01:43
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    79 minutes

    Explanation:

    1) Convert the distance, 13.1 km to miles

    Conversion factor:

    1 = 1 mi / 1.61 km

    13.1 km [ 1 mi / 1.61 km ] = 8.1336 mi

    2) Use 6.2 mi/h as a converstion factor between distance and time

    8.1366 mi * 1 / [6.2 mi/h] = 1.3124 h

    3) Convert 1.3124 h to minutes

    1.3124 h * [ 60 min/h] = 78.7 min

    Rounding to the nearest minutes (two significant figures):

    79 min ← answer
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