Réponse:
90 km/h=60 minutes
50 km/h= 50×60÷90= 33,3 minutes
130 km/h= 60 minutes
100 km/h= 100×60÷130= 46,15 minutes
100 km/h= 60 minutes
50 km= 50×60÷100= 30 minutes, il gagne 33,3-30= 3,3m
140 km/h= 60 minutes
100 km/h= 100×60÷140= 42,86 minutes elle gagne 46,15-42,86= 3,29 m
