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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 `cubic m/sec.`

B

`144 pi `cubic m/sec.`

C

80 ` cubic m/sec.

D

64 cubic m/sec.

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A
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