Question: A trough 12 feet long has a cross section in the form of an isosceles triangle (with base at the top) 4 feet deep and

A trough 12 feet long has a cross section in the form of an isosceles triangle (with base at the top) 4 feet deep and 6 feet across. If water is filling the trough at the rate of 9 cubic feet per minute, how fast is the water level rising when the water is 3 feet deep?

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