An airplane is flying on a horizontal path at a height of 6000ft, as shown in the figure. At what rate is the distance s between the airplane and the fixed point P changing with when = 20°. Express the answer in units of feet/degree. 
Definitions:
Korea
A country in East Asia, known for its rich history, culture, and division into North and South Korea in the 20th century.
China
A country in East Asia, known for its long history, vast territory, and significant influence on culture and philosophy worldwide.
Tale of Genji
An early 11th-century Japanese literary work by Murasaki Shikibu, considered the world's first novel, offering a detailed portrayal of court life in the Heian period.
Interior Space
The area or volume within the confines of a building or structure, designed and utilized for human activities and habitation.
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