Question: Points A and B move along the x- and y-axes, respectively, in such a way that the distance r (meters) along the perpendicular from the

Points A and B move along the x- and y-axes, respectively, in such a way that the distance r (meters) along the perpendicular from the origin to the line AB remains constant. How fast is OA changing, and is it increasing, or decreasing, when OB = 2r and B is moving toward O at the rate of 0.3r m > sec?

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