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Water flows from a tank of constant cross-sectional area 56 ft2 through an orifice of constant cross-sectional area 1.5 ft2 located at the bottom of the tank.

Initially the height of the water in the tank was 20 and its height t sec later is given by the following equation.

2h^(1/2) + (1/23)t -80^(1/2)

How fast was the height of the water decreasing when its height was 8 ft? (Round your answer to two decimal places.)

I thought I was just supposed to find the derivative. I keep getting wrong.

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# Homework Help: Related rates and water flow

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