KöMaL 2009 K227
Andrew and Bill are preparing for a running race. They train by running around a large regular triangular field several times. They always start simultaneously, and run at uniform speeds. Andrew starts at one vertex, and Bill starts at another. They start running towards each other. Andrew takes 4 minutes and Bill takes 5 minutes to run along one side of the field. Is it possible that they meet at a vertex of the field later on?
Official text KöMaL. Quoted with source.
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