\(\left(\frac{8}{15}+\frac{1}{10}\right)+\left(\frac{3}{5}+\frac{3}{8}\right)\)

\(\frac{8}{15}+\frac{1}{10}=\frac{19}{30}\), а \(\frac{3}{5}+\frac{3}{8}=\frac{39}{40}\).

\(\frac{19}{30}+\frac{39}{40}=\frac{193}{120}=1\frac{73}{120}\).

Ответ: \(1\frac{73}{120}\).