\[\left( \frac{1^{\backslash 3}}{5} + \frac{8}{15} \right) \cdot 6 = \frac{3 + 8}{15} \cdot 6 =\]
\[= \frac{11}{15} \cdot 6 = \frac{11 \cdot 2}{5} = \frac{22}{5} = 4,4.\]