Question

An​ airplane, flying horizontally at an altitude of 3 miles​, passes directly over an observer. If the constant speed of the airplane is 240 miles per​ hour, how fast is its distance from the observer increasing 45 seconds​ later? ​Hint: Note that in 45 seconds (three fourths times StartFraction 1 Over 60 EndFraction equals StartFraction 1 Over 80 EndFraction hour )​, the airplane goes 3 miles.

Answer 1

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