An airplane is ying at 560 miles per hour directly toward a point over an observer. The airplane is at a constant altitude of 10 miles. Find the rate at which the angle of elevation from the ground where the observer stands to the plane is changing when the angle is 30" .(i.e. % raidians). Enter the exact answer. The angle of elevation is changing at a rate of Number radians per hour. Your answer is in radians per hour because the derivatives of the trigonometric functions sin(x), cos(x), tan(x), etc. have x measured in radians