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The radius of a cylinder is increasing a...

The radius of a cylinder is increasing at the rate of 3m/s and its altitude is decreasing at the rate of 4m/s .The rate of change of volume when radius is 4m and altitude is 6m is : a)` 80 pi " cu m" //s` b)` 144 pi " cu " m//s` c)` 80 " cu " m//s` d)` 64 " cu " m//s`

A

` 80 pi " cu m" //s`

B

` 144 pi " cu " m//s`

C

` 80 " cu " m//s`

D

` 64 " cu " m//s`

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The correct Answer is:
A
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