You must get from a point P on the straight shore of a lake to a stranded swimmer who is 50 m from a point Q on the shore that is 50 m from you (see figure below). If you can swim at a speed of 2 m/s and run at a speed of 4 m/s, at what point along the shore, meters trom Q, should you stop running and start swimming if you want to reach the swimmer in the minimum time? 50 m | swim run 50 x P 50 m

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