bonsoir
1 ) 15 min = 15/60 d'h = 0.25 h
2 h 45 min = 2 h + 45/60 = 2.75 h
1 h 36 min = 1.06 h
25 min = 0.42 h environ
10 min 18 s = 0.17 h
1 h 40 min = ≅ 1.66 h
15.3 s = 0.0425 h
1.1 h = 1 h + 1 * 0.6 = 1 h 6 min
3.11 h = 3 h 6 min 36 s
0.36 h = 21 min 36 s
0.42 h = 25 min 12 s
2.8 h = 2 h 48 min
6.85 h = 6 h 51 min
3.062 h = 3 h 3 min 43 s
convertir en m /s , je te montre
16.2 km / h = 16200 : 3 600 = 4.5 m / s
3.96 km / h = 3960 : 3600 = 1.1 m /s
continue
convertir en km/ h , c'est l'inverse
35 m / s = 0 .035 x 3 600 = 126 km / h
2.8 m / s = 0.0028 x 3600 = 10.08 km / h
continue