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Gas is being pumped into a a spherical b...

Gas is being pumped into a 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

A

`1/(30pi)` ft/min.

B

`1/(15pi)` ft/min.

C

`1/(20)` ft/min.

D

`1/(25)` ft/min.

Text Solution

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The correct Answer is:
A
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