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Deux cyclistes font une course sur deux pistes circulaires concentriques. Le premier cycliste C1 tourne sur la piste de rayon 150 m, le second cycliste C2 tourne sur la piste de rayon 200 m. C1 tourne avec une vitesse linéaire v1 de 30 km/h.4. Déterminez la durée T2 permettant au cycliste C2 d'effectuer un tour de piste.

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