The point on the ellipse 9x² + 16y² = 144, where the ordinate decreases at twice the rate the abscissa increases is (a, b), then √13(b - a) is:

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The point on the ellipse 9x2 + 16y2 = 144, where the ordinate decreases at twice the rate the abscissa increases is (a, b), then √13(b - a) is: