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Sur une route, on distingue 2 points A et B. En A se trouve un chien et en B se trouvent 2 promeneurs. Le chien part dans la direction de B. Au même moment les 2 promeneurs partent dans des directions opposées. Le chien croise les promeneurs, l'un en C1 et l'autre en C2.Sachant que les 2 promeneurs se déplacent à la même vitesse, et que le chien se déplace 3 fois plus vite que les promeneurs, que vaut AB ?(1) La distance C1 C2 mesure 6 km.(2) La distance C2 B est égale à la moitié de la distance AB.

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