That is the fraction ...
[tex]\displaystyle\frac{\left(\frac{3}{10}\right)}{\left(6\frac{3}{5}\right)}=\frac{\left(\frac{3}{10}\right)}{\left(\frac{33}{5}\right)}=\frac{\left(\frac{3}{10}\right)}{\left(\frac{66}{10}\right)}\\\\=\frac{3}{66}=\bf{\frac{1}{22}}[/tex]
3/10 is 1/22 of 6 3/5.
