The volume of a metal hollow sphere is c...

The volume of a metal hollow sphere is constant. If the outer radius is increasng at the rate of `1/4` cm per sec. The rate at which the inner radius is increasing when the radii are 8 cm and 4 cm repectively is

A

4 cm/sec

B

3 cm/sec

C

2 cm/sec

D

1 cm/sec

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The correct Answer is:

A

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