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Acertijo 45

by Kimi R in Others

7 by February by 2018

Se tienen dos relojes de arena. Uno dura 4 minutos, y el otro 7. Se quieren medir 9 minutos.
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1 COMMENTS

EagleFlyFree - 7 by February by 2018, 20:06

Se ponen ambos relojes en marcha. Cuando se acaba el de cuatro, se le da la vuelta. Cuando se acaba el de siete, se le da la vuelta. Cuando se vuelve a acabar el de cuatro (han pasado ocho minutos) se vuelve a girar el de siete, que tiene justo un minuto y cuando se acaba han pasado los nueve.

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