A cone-shaped tank of water is leaking water at a constant rate of 2 m3/hour. If the base radius of the tank is 5 m and the height of the tank is 14 m, at what rate is the water level changing when the depth is 6 m?

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A: NOTE: Refresh your page if you can't see any equations. . here we have R=3 H=6 V'=12

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