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SALAM

 

les montres de ALI et OMAR ne sont pas bien reglées.celle de ALI indique 19 heures mais elle avance de 10 minutes par heures,celle de OMAR indique 17 heures,mais elle retarde de 10 minutes par heures.

quelle heure est-il sachant que ces montres ont etes mises a l'heure au meme moment.

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