Bonjour,
Par exemple :
Ex. 2 :
15 mn = 15/60 h = 1/4 h = 0,25 h
12 mn = 12/60 h = 1/5 h = 0,2 h
1 h 03 mn = 1 h + 3/60 h = 1 h + 1/20 h = 1 h + 0,05 h = 1,05 h
3 h 42 mn = 3 h + 42/60 h = 3 h + 7/10 h = 3 h + 0,7 h = 3,7 h
...etc...etc...etc.....
Ex. 3 :
7 mn = 7/60 h ≅ 0,12 h
3 h 28 mn = 3 h + 28/60 h = 3 h + 7/15 h ≅ 3 h + 0,47 h ≅ 3,47 h
4 h 21 mn = 4 h + 21/60 h = 4 h + 7/20 h = 3 h + 0,35 h = 3,35 h
...etc...etc...etc....
Ex. 4 :
0,20 h = (0,20 × 60) mn = 12 mn
3,15 h = 3 h + (0,15 × 60) mn = 3 h 09 mn
1,70 h = 1 h + (0,70 × 60) mn = 1 h 42 mn
....etc....etc....etc.....
Ex. 5 :
35 s + 85 s = 120 s = 2 × 60 s = 2 mn
13 mn 10 s + 2 mn 20 s = 15 mn 30 s
2 mn 20 s + 40 s = 2 mn 60 s = 3 mn
...etc...etc....etc....
