Mathematics, 07.12.2020 19:00, 223103

A plane flies horizontally at an altitude of 4 km and passes directly over a tracking telescope on the ground. When the angle of elevation is pie/6, this angle is decreasing at a rate of pie/4 rad/min. How fast is the plane traveling at that time?

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A plane flies horizontally at an altitude of 4 km and passes directly over a tracking telescope on t...