A container is in the shape of an invert...

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

`3/(4pi)`

`2/(9pi)`

`16pi`

`2pi`

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