Réponse:
4. 10h car 270/180=1.5
5. 270km/h car 360x0.75=270
6.1 environ 121km/h car 3h12=192 minutes, 304/192=1.5833, 192/1.5833=121
6.2 1.46m/s car 9min 12 = 549min, donc 800/549=1.46
6.3 23.75km car 19x1.25=42.75 (1.25 car 1 heure + 0.25 heure)
voilaaaa