Question: A trough is 16 ft long and its ends have the shape of isosceles triangles that are 5 ft across at the top and have

A trough is 16 ft long and its ends have the shape of isosceles triangles that are 5 ft across at the top and have a height of 1 ft. If the trough is filled with water at a rate of 13 ft³/min, how fast (in ft/min) is the water level rising when the water is 9 inches deep?

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