A plane flies at a speed 500\displaystyle {500} km/hr at a constant height of 20\displaystyle {20} km. How rapidly is the angle of elevation to the plane changing when the plane is directly above a point 105\displaystyle {105} km away from the observer?

The angle of elevation is changing at radians/hr (enter a positive value). Round your answer to 3 decimal places.

 

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