math
posted by Yen .
one hundred feet directly overhead, a plane and a dirigible start flying due east. If the plane travels three times faster than the dirigible, what is the greatest angle of sight between the two vehicles from your position? Assume the plane passes from sight after 6000 feet.

An airplane was preparing for landing.When it began its descent towards the airport, the plane's altitude was 22,000 feet.Twelve minutes later,its altitude was 6000 feet
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