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A balloon which always remains spheric...

A balloon which always remains spherical is being inflated by pumping in 10 cubic centrimeters of gas per second . Find the rate at which the radius 15 cm .

A

`(1)/(90pi)` cm/sec

B

`(1)/(9pi)` cm/sec

C

`(1)/(30pi)` cm/sec

D

`(1)/(pi)` cm/sec.

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The correct Answer is:
A
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