Let's rewrite this question a bit.
[tex]2\frac{3}{5}=\frac{13}{5} \\[/tex]
So, if we want to divide [tex]\frac{3}{5}[/tex] by [tex]-3[/tex], we can write it like this,
[tex]\frac{3}{5} \div -3=\frac{3}{5} \times -\frac{1}{3}= -\frac{1}{5}[/tex]
Now, we are also asked to divide [tex]\frac{3}{5}[/tex] by [tex]\frac{3}{4}[/tex].
[tex]\frac{3}{5} \div \frac{3}{4}=\frac{3}{5} \times \frac{4}{3}= -\frac{4}{5}[/tex]
Hope this helps! :)
A small thing I would like to mention -> In case this wasn't clear or you didn't know, when dividing fractions, we take the reciprocal of the 2nd fraction and then multiply into the first.
So a general formula would look like this:
Let [tex]a,b[/tex] be fractions, then if we want to divide we do,
[tex]a \div b = a \times \frac{1}{b}[/tex]
