hint:
the surface area of the water times the rate of change of depth equals the 2 m^3/second inflow rate.
related rates: the base of a pyramid-shaped tank is a square with sides of length 12 meters, and the vertex pyramid is 13 meters above the base. the tank is filled to a depth of 5 meters, and water is flowing into the tank at the rate of 2 cubic meters er second. find the rate of change of the depth of water in the tank.
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