?A plane flies horizontally at an altitude of 5 km and passes directly over a tracking
Chapter 3, Problem 47(choose chapter or problem)
A plane flies horizontally at an altitude of 5 km and passes directly over a tracking telescope on the ground. When the angle of elevation is 𝜋/3, this angle is decreasing at a rate of 𝜋/6 rad/min. How fast is the plane traveling at that time?
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