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The radius of a cylinder is increasing a...

The radius of a cylinder is increasing at the rate of 3 m/sec and its attitude is decreasing at the rate of 4m/sec. The rate of change of volume when radius is 4 metres and attitude is 6 metres is

A

`80 pi cum`/sec

B

`144 pi cum`sec

C

`-80 cum`/sec

D

`64 cum`/sec

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The correct Answer is:
A
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