bonjour
7 h 24 min 12 s - 3 h 55 min 48 s = 3 h 28 min 24 s
3.2 h = 3 h + 0.2 *60 = 3 h + 12 min
7.55 h = 7 h + 0.55 x 60 = 7 h 33 min
9.95 h = 9 h 57 min
5/100 h = 0.05 h = 180 s ou 3 min
5.7 min = 5 min 42 s
7.25 = 7 min 15 s
9.1 min = 9 min 6 s
35/100 min = 21 s