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A trough is 8 ft long and its ends have the shape of isosceles triangles that...

A trough is 8 ft long and its ends have the shape of isosceles triangles that are 2 ft across at the top and have a height of 1 ft. If the trough is being filled with water at a rate of 13 ft^3/min, how fast is the water level rising when the water is 6 inches deep?

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