The mainland is 100 miles away. They each decide to try to swim there individually.
The brunette goes first; she swims 25 miles, then gets eaten by a shark.
The redhead goes second; she swims 40 miles, gets tired, and drowns.
Finally it's the blonde's turn. She swims 50 miles, then says: "Wow this is tiring, I'm not sure if I can continue" and swims back to the island.
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