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Ryan takes 12 minutes to rake up and bag a pile of leaves. His sister Kareesa takes twice as long. How many minutes would it take both of them working together to complete 10 bags of leaves

  • math -

    Ryan's rate per bag = 1/12
    sister's rate ber bag = 1/24
    combined rate = 1/12 + 1/24 = 3/24
    time per bag working together = 1/(3/24) = 24/3 = 8 minutes

    so it would take them 80 minutes to do 10 bags

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