20 min von 60 min

1/3

$${\frac{{\mathtt{20}}}{{\mathtt{60}}}} = {\frac{{\mathtt{1}}}{{\mathtt{3}}}} = {\mathtt{0.333\: \!333\: \!333\: \!333\: \!333\: \!3}}$$ =  33,33 %  = $$33\frac{1}{3}$$  %

Gruß radix !