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A container is the shape of an inverted cone. Its height is 6m and radius is 4 m at the top. If it is filled with water at the rate `3m^(3)//min` then the rate of change of height of water (in mt//min) when the water level is 3 m is

A

`(3)/(4pi)`

B

`(2)/(9pi)`

C

`16 pi`

D

`2 pi`

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The correct Answer is:
A
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