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Mathematics 8 Online
OpenStudy (anonymous):

A plane is located x=40 miles (horizontally) away from an airport at an altitude of h miles. Radar at the airport detects that the distance s(t) between the plane and airport is changing at the rate of s'(t)=-240 mph. If the plane flies toward the airport at the constant altitude h=4, what is the speed abs[x'(t)] of the airplane?

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