bonjour
4.5 h = 4 h + 5 x 0.6 = 4 h 30 min
12.25 h = 12 h + 25 x 0.6 = 12 h 15 min
6. 2 h = 6 h + 0.2 * 0.6 = 6 h 12 min
0.45 h = 0.45 x 0.6 = 27 min
0.8 h = 48 min
2 h 27 min = 2 h + 27/60 = 2.45 h
1 h 36 min = 1 h + 36/60 = 1.6 h
allez continue tu as la méthode