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A trapezoidal tough is 10 ft long, 4 ft wide at the top, 2 ft wide...

A trapezoidal tough is 10 ft long, 4 ft wide at the top, 2 ft wide at the bottom and 2 ft deep. If water flows in the 10 ft^3/ min, find how fast the surface is rising, when the water is 6 in deep. How fast the water surface is rising when the water is 1 foot deep.

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