Four elderly have to cross a bridge, which supports the passage of two, many with a flashlight and have to return her to the other, if one takes 10 min.
In crossing, 2 takes 5 minutes, 3 takes 2 minutes and 4 takes 1 minutes what it takes less time to cross?
Posted by: Noelia Grau, Maria Pacheco and Maria Gomez
Source: http://www.acertijosyenigmas.com/categorias/acertijos-dificiles/page/2/
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