bonjour,
1.4 h = 1 h + 0.4 * 60 = 1 h 24 min = 84 min
4.2 h = 4 h + 0.2 *60 = 4 h 12 min = 252 min
3.25 h = 3 h + 0.25 * 60 = 3 h 15 min
500 s = 8*60 + 20 = 8 min 20 s
78 min = 1 *60 + 18 = 1 h 18 min
126 min = 2*60+ 6 = 2 h 6 min
0.6 h = 0.6 * 60 = 36 min
0.63 h = 0.63 * 60 = 37 , 8 min = 37 min 48 s
4 854 s = 1*3600+1254
1254 = 20*60 +54
4 854 s = 1 h 20 min 54 s
1 h 25 = 1 h + 25/60 = 1.41 h environ
1 h 25 min = 1 * 3600 + 25 *60 = 5 100 s
