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21 May, 09:51

Mary ran the 5 kilometre race in 45 minutes. Melanie ran the 2 kilometre race in 17 minutes. Which runner ran the faster race? What was that rate per hour

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  1. 21 May, 13:00
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    Mary ran the 5 kilometre race in 45 minutes.

    45 minutes = 3/4 of an hour

    This means that her speed is

    S/t=5 / (3/4) = 20/3 = 6+2/3 (km / hour)

    Melanie ran the 2 kilometre race in 17 minutes.

    17 minutes = 17/60 of an hour

    This means that her speed is

    S/t=2 / (17/60) = 120/17 = 7+1/17 (km / hour)

    So, Melanie is faster than Mary.
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