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Find the time required for the water level in a tank to drop 1 foot

Consider a water tank with vertical sides and with cross-section a square of area 4 feet. Water exits the tank through a hole which as area equal to \frac{5}{3} square inches. The water level is initially 2 feet above the level of the hole. Find the time required for the water level to drop 1 foot.


Incomplete.

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