An airplane is flying at 630 miles per hour directly toward a point over an observer. The airplane is at a constant altitude of 5 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. π/6 radians).
enter the exact answer
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.