1 h = 60 mn donc :
2 h = 2 × 60 = 120 mn
3,5 h = 3,5 × 60 = 210 mn
4 h 28 mn = 4 × 60 + 28 = 268 mn
5,2 h = 5,2 × 60 = 312 mn
1 mn = 1/60 h
donc :
24 mn = 24 × 1/60 = 0,4 h
51 mn = 51 × 1/60 = 0,85 h
2 h 45 mn = 2h + 45/60 h = 2 h + 0,75 h = 2,75 h
1 h = 3 600 s donc 1 s = 1/3600 h
donc : 7560 s = 7560 × 1/3600 = 2,1 h
