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Air is being pumped into a spherical bal...

Air is being pumped into a spherical balloon at the rate of 30 `cm^(3)//s`. Then the rate (in `cm//s`) at which the radius increases when it reaches the value 15 cm , is-

A

`(1)/(30 pi)`

B

`(1)/(15 pi)`

C

`(1)/(20)`

D

`(1)/(25)`

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The correct Answer is:
A
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CHHAYA PUBLICATION-MCQ ZONE 3 -Question Paper 4
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