3. Suppose that the following information about a function f is known. It has continuous partial derivatives. From point (8,5) in the direction of point (9,5), the directional derivative is known to be 2. From point (8,5) in the direction of point (8,6), the directional derivative is 15. Determine the directional derivative from point (8,5) in the direction of the point (16, 20).

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