[tex]2 \frac{1}{4} min \\ \\ 2 \frac{1}{4} \times 60 = \frac{9}{4} \times \frac{60}{1} = 9 \times 15 = 135s[/tex]
[tex] \frac{1}{3} kwadransa \\ \\ \frac{1}{3} \times 15 = \frac{1}{3} \times \frac{15}{1} = 1 \times 5= 5min[/tex]
[tex]3 \frac{1}{3} kwadransa \\ \\ 3 \frac{1}{3} \times 15 = \frac{10}{3} \times \frac{15}{1} = 10 \times 5= 50min[/tex]
