Related rates/Optimization problem, please show how to solve the problem, not just the answer. Thank you!

1. Everyday a flight to Atlanta flies directly over Janae's home at a constant altitude of 4 miles. If she assumes that the plane is flying at a constant speed of 400 mph, at what rate is the angle of elevation of Janae's line of sight with respect to time when the horizontal distance between the approaching plane and Janae is exactly 3 miles? Express your answer in degrees per second to three decimal places.