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Lors d'un premier lancement de 2 fusées, les 2 fusées atteignent la planète Z en même temps. Lors du deuxième essai, une des 2 fusées met un temps 20 % inférieur à celui qu'elle avait mis la première fois, alors que la seconde augmente son temps de 20%. Quel temps a mis la plus rapide lors du deuxième essai ? (1) Au deuxième lancement, la différence de leur temps est de 30 secondes. (2) La fusée la plus rapide a mis les 2/3 du temps de la fusée la plus lente pour atteindre la planète Z.

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