bjr
1h = 60 min = 3600 s
et 1 min = 60 s
60 s .......... 1 min
360 s ...... n min
n = 360 x 1 : 60 = 6 => 6 min
4,5 h = 4,5 x 60 = 270 min
2h = 2 x 3600 = 7200 s
8 min et 12 s = 8 x 60 s + 12 s = 492 s
1h 23 min = 1 x 60 + 23 = ...... min
et
2h 10 min = 2x3600 s + 10 x 60 s = .....s
