on a 1h = 60 mn
2h 16 mn en minutes = (60 x 2) +16 = 120 +16 = 136 mn
3 h 10 mn en minutes = (3x 60) +10 = 180 +10 =190 mn
5h 4 mn en minutes = (5x 60) +4 = 300 + 4 = 304 mn
on a 1mn = 60 s et 1h = 3600 s
6min 14s en seconde = 6x 60 +14 = 360 +14 = 374 s
1h30 mn en seconde = 3600 + (30 x 60) = 3600 +1800 = 5400 s
2h10 mn 15s en seconde = (3600x2) +(10x60) +15= 7200 +600 +15 = 7815 s
