A water trough 2 ft across, 4 ft long, and 1 ft deep has ends in the

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A water trough 2 ft across, 4 ft long, and 1 ft deep has ends in the shape of isosceles triangles. (See the figure.) It is being filled with 3.5 ft3 of water per minute. Find the rate at which the depth of water in the tank is changing when the water is 1/3 ft deep.

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