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Homework Statement
If it takes 17 seconds to blow up a balloon to 8 cm in diameter, how much longer will it take to inflate the balloon to 24 cm in diameter? Assume that the pressure that the balloon exerts on the air inside is proportional to the surface area of the balloon, that you blow a constant number of molecules of air per unit time into the balloon regardless of the pressure, and that the balloon retains the same shape as it is being inflated.
Homework Equations
V = 4/3 pi r^3
SA = 2pi r^2
The Attempt at a Solution
I've found out how much volume each size contains, subtracted one from the other, then applied the rate to the volume and it is wrong