Répondre :
Exo.1
1h23min20s = (1+23/60+20/3600) = 1,39 heures
1,39 h * 72 km/h = 100,08 km
Exo.2
63 km/h = 63*1000/3600 m/s = 17,5 m/s
12,5 m/s = 12,5/1000*3600 = 45km/h
Exo.3
15m = 58,2 pieds = 58 pieds, 2.4 pouces
4 yards, 2 pieds et 7 pouces = 4*3+2+7/12 = 14,58 pieds
14,58 / 3,88 = 3,76m
1h23min20s = (1+23/60+20/3600) = 1,39 heures
1,39 h * 72 km/h = 100,08 km
Exo.2
63 km/h = 63*1000/3600 m/s = 17,5 m/s
12,5 m/s = 12,5/1000*3600 = 45km/h
Exo.3
15m = 58,2 pieds = 58 pieds, 2.4 pouces
4 yards, 2 pieds et 7 pouces = 4*3+2+7/12 = 14,58 pieds
14,58 / 3,88 = 3,76m