Bonsoir
98 s = 1 x 60 + 38 = 1 min 38 s
67 h = 2 x 24 + 19 = 2 jours 19 h
420 s = 7x 60 = 7 min
8 h 4 min = 8 x 60 + 4 = 484 min
4 h 32 min = 4 x 60 + 32 = 392 min
8.5 h = 8 h + 0.5 * 60 = 8 h 30 min
4.35 h = 4 h + 0.35 * 60 = 4 h 21 min
6.9 h = 6 h 54 min
16 h 28 = 16.46 h