A train approaches a 800 m long tunnel AB.Inside the tunnel there is a rabbit when the train whistles,the rabbit runs.If the rabbit moves to the entrance of tunnel A,the train catches the rabbit exactly at the entrance.If the rabbit moves to exit B,then the train catches the rabbit at the exit.If the speed of the train is 4 times the speed of the rabbit,what is the distance of the point the train whistles from the entrance of tunnel.

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