First, find a common denominator for the two fractions, which in this case is 15.

[tex]\frac{11}{15} - \frac{3}{5}[/tex]

Rewrite the fractions with the common denominator:

[tex]\frac{11}{15} - \frac{9}{15}[/tex]

Subtract the numerators:

[tex]\frac{11 - 9}{15}[/tex]

[tex]\frac{2}{15}[/tex]

So, [tex]\frac{11}{15} - \frac{3}{5} = \frac{2}{15}[/tex]