PROBLEME 1
Un dauphin partant de 5 m de profondeur , monte de 10 m , plonge de 60 m , remonte de 70 m , replonge de 60 m , remonte de 10 m , replonge de 20 m , remonte de 80 m , replonge de 50 m puis remonte de 20 m .

A quelle distance de la ligne de flottaison se trouve le dauphin ?
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