6. A hemispherical water tank, shown below has a radius of 6 meters and is losing water. The area of urface of the water is A = 12лh - nh² square meters, where h is the depth, in meters, of the water = tank. When h = 3 meters, the depth of the water is decreasing at a rate of meter per minute. At that nt, what is the rate at which the area of the water's surface is decreasing with respect to time?

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