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

A trough is 8 ft long and it's ends have the shape of isosceles triangles that are 4 ft across at the top and have a height of 1 ft. If the trough is being filled with water at a rate of 13ft^3/min, how fast is that water level rising when the water is 7 inches deep?

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