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A plane flies at a speed 500 km/hr at a constant height of 10 km. How rapidly is the angle of elevation to the plane

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A plane flies at a speed 500 km/hr at a constant height of 10 km. How rapidly is the angle of elevation to the plane changing when the plane is directly above a point 140 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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