Points A and B move along the z and y axes, respectively, in such a way that the distancer (in inches) along the perpendicular from the origin O to the line segment AB remains constant, as demonstrated in the applet below. How fast is the length of OA changing at the instant when OB has length 2.5r and B is moving toward the origin at a rate of 0.1r inches per second? Note: Your answer will be an expression in terms of r. Move the slider to see the effect on point A when point B is moved A Round any decimals to 4 places. B.