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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`.

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The correct Answer is:
A
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