Pai, ar trebui sa stii ca o ora are 60 minute
[tex] \frac{1}{2} *60'=30' \\ \frac{3}{4} *60'= \frac{180}{4} =45' \\ \frac{1}{10} *60'=6' \\ \frac{1}{6} *60'=10' \\ \frac{1}{5} *60'=12' \\ \frac{1}{3} *60'=20' \\ \frac{2}{3} *60'= \frac{120}{3} =40' \\ \frac{2}{5} *60'= \frac{120}{5} =24'[/tex]