Réponses

2013-10-13T18:39:58+02:00
On mets tout en secondes.
2h = 7 200s
11min = 660s
3s
7 200 + 660 + 3 = 7 863s

-

1h = 3 600s
56min = 3 360s
52s
3 600 + 3 360 + 52 = 7 012s

7 863 - 7 012 = 851s