Fifteen People are trapped aboard a ship that's going to sink in exactly twenty minutes. Their only chance for survival is the five person life raft stowed on their vessel. To make matters worse, the waters around the ship are teeming with man-eating sharks, so swimming to safety is out of the question.
A round trip to the nearest island and back to the boat takes nine minutes on the raft. How many people will live to see dry land?
This puzzle is worth 500 gold and
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