differentiation

Question: Gas is being pumped into a spherical balloon at the rate of $30 ft^3/min$. Then the rate at which the radius increases when it reaches the value 15 ft is



1) $\frac{1}{30\pi }ft/\min \text{.}$
2) $\frac{1}{15\pi }ft/\min \text{.}$
3) $\frac{1}{20}ft/\min \text{.}$
4) $\frac{1}{25}ft/\min \text{.}$
Solution: Explanation: No Explanation
Application of Derivatives

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