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20 May, 11:19

Kristen can run at 15 km/h and walk at 5 km/h. She complete for a 42 km marathon in 4 hours. What distance did Kristen run during the marathon?

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  1. 20 May, 12:35
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    Let x be the time she ran and y be the time she walked

    then distance ran = 25x and distance walked = 5y

    so 15x + 5y = 42

    and x + y = 4

    * second equn. by - 5:-

    -5x - 5y = - 20

    add this to the first equn:0

    10x = 22

    x = 2.2

    distance she ran = 2.2 * 15 = 33 km
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