Bonjour,
1)
parcours total:
57mn 16s + 1h29mn 30s + 38mn 44s + 2h 07mn 19s=
3h 131mn 109s
109s = 60s + 49s =1mn 49s
131mn +1mn = 132mn = 60 mn + 60mn + 12mn =
2h12mn
3h+2 h =5h
=> 5h 12mn 49s
2)
7h02mn 46s - 5h12mn 49s =
on convertit 1h en mn et 1mn en secondes
6h 61mn 106s -5h12mn 49s = 1h 49mn 57s pour le 5° jour
