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Dos amigos salen en bicicleta de sus casas situadas a 16 kilómetros una de la otra. Caminan sobre el periférico en sentidos opuestos, para encontrarse. Uno de ellos va a 7 km por hora, el otro a 9 km por hora. Si salieron a las 6 de la mañana. ¿a qué hora se en¡nctrarÃon?

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