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16 February, 23:57

A runner wants to run 11.8 km. Her running pace is 7.4 mi/hr. How many minutes must she run? Express your answer using two significant figures.

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  1. 17 February, 01:16
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    She must run 59 min to run 11.8 km.

    Explanation:

    Hi there!

    First let's convert mi/h into km/min:

    7.4 mi/h · (1.61 km / 1 mi) · (1 h / 60 min) = 0.20 km/min (notice how the units mi and h cancel).

    The runner runs at 0.20 km / min, i. e., every minute she travels 0.20 km.

    If 0.20 km are traveled in 1 min, then 11.8 km will be traveled in:

    11.8 km / 0.20 km/min = 59 min

    She must run 59 min to run 11.8 km.
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Home » Physics » A runner wants to run 11.8 km. Her running pace is 7.4 mi/hr. How many minutes must she run? Express your answer using two significant figures.
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