$$ \dfrac{3}{5} $$
It can be written as
$$ \dfrac{3}{5} = \dfrac{3 \times 2}{5 \times 2} = \dfrac{6}{10} $$
$$ \dfrac{3}{5} = \dfrac{3 \times 3}{5 \times 3} = \dfrac{9}{15} $$
$$ \dfrac{3}{5} = \dfrac{3 \times 4}{5 \times 4} = \dfrac{12}{20} $$
Therefore , $$ \dfrac{6}{10} , \dfrac{9}{15} $$ and $$ \dfrac{12}{20} $$ are the rational numbers which are equivalent to the given rational number $$ \dfrac{3}{5} $$.