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An inverted circular cone shaped tank with base radius 2m and height 3m is full of water. The water is being drained at the rate

An inverted circular cone shaped tank with base radius 2m and height 3m is full of water. The water is being drained at the rate of 9m3/minute (9 meters cubed per minute). How fast is the water level dropping when the water level in the tank is at half it's height? Give your answer as an exact expression

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