| a) | Transforme en minutes. |
2
h 15 min |
= (2 . 60 min ) + 15 min |
| = 120 min + 15 min | |
| = 135 min | |
5
h 12 min |
= (5 . 60 min ) + 12 min |
| = 300 min + 12 min | |
| = 312 min | |
7
h 35 min |
= (7 . 60 min ) + 35 min |
| = 420 min + 35 min | |
| = 455 min | |
15
h 15 min |
= (15 . 60 min ) + 15 min |
| = 900 min + 15 min | |
| = 915 min | |
27
h 58 min |
= (27 . 60 min ) + 58 min |
| = 1 620 min + 58 min | |
| = 1 678 min | |