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Les machines A et B remplissent des bouteilles de soda avec des débits différents. La machine A fonctionne seule pendant 4h mais ne permets pas de remplir la totalité des bouteilles. Puis la machine B opère seule pendant 3 heures, et remplit le reste de ce lot. Si la machine B tombe en panne, combien d'heure faudrait-il à la machine A pour remplir la totalité de la production. (1) La machine A produit 30 bouteilles par heure(2) La machine A produit deux fois plus de bouteilles en 4heures que la machine B en 3heures

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