An airplane flies at an altitude of y = 6 miles toward a point directly over an observer (see figure). The speed of the plane is 600 miles per hour. Find the rates (in radians per hour) at which the angle of elevation 0 is changing when the angle is 0 = 45, 0 = 60, and 0 = 75. (a) (b) (c) 0 = 45 0 = 60 rad/hr rad/hr y mi Not drawn to scale 0 = 75 (Round your answer to two decimal places.) rad/hr