Réponses

2013-05-10T12:55:36+02:00
2013-05-10T13:10:21+02:00

1) 3000 m soit 3 km et 40 m = 0,4 h 

v = d/t = 3/0.4 = 7.5 km/h j

2) 3 + 80 + 16.8 = 99.8 km