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Math Help - Help! Related rates with the chain rule

  1. #1
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    Help! Related rates with the chain rule

    Here is the question
    I inflate a spherical balloon by blowing 1000cm^3 of air into it every 5 seconds.
    a/ what is the rate of change of the volume of the balloon (in cm^3/sec), at the moment when the radius of the balloon is 5cm?
    b/ what is the rate of change of the radius of the balloon (in cm/sec), at the moment when the radius of the balloon is 5cm?

    So the Dv/Dt is (-200cm^3/sec) right? Then what?
    Please Help!!
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  2. #2
    MHF Contributor Calculus26's Avatar
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    V =4/3pi^r^3

    dV/dt = 4pi*r^2*dr/dt

    Now use your data
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