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Mathematics 16 Online
OpenStudy (anonymous):

Two airplanes A and B are flying horizontally at the same altitude so that the position of B is southwest of A and 20 km to west an 20 km to the south of A. Suppose plane A is flying due west at 16 km/min and plane B is flying due north at 21.3 km/min. How many seconds the planes will be closest and what their closest distance is

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