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Mathematics 19 Online
OpenStudy (anonymous):

Related Rates Question (Calc 1) 8) (Airplane problem). A military plane maintains an altitude of 15,000 feet over a vast flat desert. It flies at a constant speed on a line that will take it directly over an observer on the ground. At noon, the angle of elevation from the observer to the plane is 30 degrees, and the angle of elevation is increasing at a rate of 2.2 degrees per second. Find the speed of the plane at noon. Round off your answer to five significant digits. What is the speed in miles per hour (mph)?

OpenStudy (anonymous):

I can't figure how to set up the equation, I have no problem doing the implicit differentiation and solving.

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