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Related Rates

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Question #45.
Solve each related rate problem. A conical paper cup is $20\,cm$ tall with a radius of $10\,cm.$ The bottom of the cup is punctured so that the water leakes out at a rate of $\frac{16\pi}{3} \,cm^{3}/sec.$ At what rate is the water level changing when the water level is $8\,cm?$
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