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A balloon is in the shape of a cone surm...

A balloon is in the shape of a cone surmounted by a hemi sphere. The diameter of the sphere is equaled to the height of the cone. If the height of the balloon is 9 cm then the rate of change in its volume is ---------- times the rate of change in its height is (A) `64pi` (B) `6pi` (C) `12pi` (D) `3pi`

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