A World Class Swimmer's Puzzle
A world-class swimmer can swim at twice the speed of the prevailing
tide.
She swims out to a buoy and back again, taking four minutes to make the round-trip.
How long would it take her to make the identical swim in still water?
She swims out to a buoy and back again, taking four minutes to make the round-trip.
How long would it take her to make the identical swim in still water?
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