Bonjour:

18*60+ 24 = 1 080+24 = > 1 104 s

1h = 3 600s

1 100m = 1,1km

1 104s -> 1,1km

1s -> 1,1/1 104

3 600s -> (1,1*3 600)/1 104

=>3,59km/h

3,59km/h < 4km/h

donc, oui