namely their difference, well, let's firstly convert the mixed fractions to improper fractions and then subtract the wingspan of the gull from the albatross'.
[tex]\bf \stackrel{mixed}{3\frac{3}{5}}\implies \cfrac{3\cdot 5+3}{5}\implies \stackrel{improper}{\cfrac{18}{5}}~\hfill \stackrel{mixed}{1\frac{7}{10}}\implies \cfrac{1\cdot 10+7}{10}\implies \stackrel{improper}{\cfrac{17}{10}} \\\\[-0.35em] ~\dotfill\\\\ \stackrel{albatross}{\cfrac{18}{5}}-\stackrel{gull}{\cfrac{17}{10}}\implies \stackrel{\textit{using an LCD of 10}}{\cfrac{(2)18-(1)17}{10}}\implies \cfrac{36-17}{10}\implies \cfrac{19}{10}\implies 1\frac{9}{10}[/tex]
