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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)/(25)` ft/min

B

`(1)/(20)` ft/min

C

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

D

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

Text Solution

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The correct Answer is:
D
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