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if you walk for m minutes, the number c of calories used is proportional to the time you walk. if 30 caloris are used when you walk for 12 minutes, write an equation of variation and find the number of calories used when you walk for an hour

  • math -

    C ∝ t
    C = kt, where k is a constant
    for C=30 , t = 12
    30 = k(12)
    k = 30/12 = 5/2

    C = (5/2)t
    so for t=60
    C = (5/2)(60) = 150

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