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Gas is being pumped into a spherical bal...

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 15ft is

A

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

B

`1/(5 pi)(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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