б) $$ \frac{5}{12} $$ и $$ \frac{7}{60} $$.
$$ \frac{5}{12} = \frac{5 \cdot 5}{12 \cdot 5} = \frac{25}{60} $$$$ \frac{7}{60} = \frac{7 \cdot 1}{60 \cdot 1} = \frac{7}{60} $$
Ответ: $$ \frac{25}{60} $$ и $$ \frac{7}{60} $$