Bonsoir
Calculer la vitesse en km/h :
V = D/T
D = 250 km
T = 4 h
V = 250/4
V = 62,5 km/h
D = 620 km
T = 3h 30min = 3h + 30/60 h = 3h + 0,5 h = 3,5 h
V = 620/3,5
V ~ 177 km/h
D = 12 km
T = 45 min = 45/60 h = 0,75 h
V = 12/0,75
V = 16 km/h
D = 750 m = 0,75 km
T = 20 min = 20/60 h = 1/3 h
V = 0,75/(1/3)
V = 0,75 x 3
V = 2,25 km/h
D = 5100 m = 5,1 km
T = 150 s = 150/3600 h = 15/360 h = 1/24 h
V = 5,1/(1/24)
V = 5,1 x 24
V = 122,4 km/h