bonsoir
2 min 24 s = 144 s
144 = 2 x 72
72 = 2 x 36
36 = 2 x 18
18 = 2 x 9 décomposition = 2 ⁴ * 3 ²
9 = 3 x 3
3 = 3 x 1
3 min 18 s = 198 s
198 = 2 x 99
99 = 3 x 33 décomposition = 2 * 3² * 11
33 = 3 x 11
11 = 11 x 1
PPCM = 1 584
1 584 s = 26 min 24 s
17 h + 26 min 24 s = 17 h 26 min 24 s