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The radius of a cylinder is increasing ...

The radius of a cylinder is increasing at the rate of 3 m/s and its altitude is decreasing at the rate of 4m/s. The rate of change of volume `(m^(3)//s)` when radius is 4 m and altitude 6 m is -

A

`144pi`

B

80

C

`-80pi`

D

`80pi`

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The correct Answer is:
D
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