Question

Transformati:
in secunde: 1 supra 4 min  ;  3 supra 2  min
in minute : 1 supra 2  h ;1 supra 3 h ; 1 supra 12 h ; 2 supra  5 h ; 5 supra 6 h ; 3 supra 20 h

Answer 1

1/4 min=1:4=0,25 min=15 sec.
3/2min=3:2=1,5 min=90 sec.
1/2h=1:2=0,5h=30 min
1/3h=1:3=0,33=20 min
2/5h=2:5=0,4h=24 min
5/6h=5:6=0,83h=50 min
3/20h=3:20=0,15h=9 min