calculer chaque fraction d heure en minute : 7/60h - 3/10h - 4/3h - 5/6h - 9/20h

7/60 h = 7/60 x 60 = 7 minutes

3/10 h = 3/10 x 60 = 18 minutes

4/3 h = 4/3 x 60 = 80 minutes 

5/6 h = 5/6 x 60 = 50 minutes

9/20 h = 9/20 x 60 = 27 minutes