\[1)\ 3\frac{1}{6} - 1\frac{1^{\backslash 2}}{3} = 3\frac{1}{6} - 1\frac{2}{6} =\]
\[= 2\frac{7}{6} - 1\frac{2}{6} = 1\frac{5}{6}\ (ч) - на\ путь\ \]
\[из\ \text{B\ }в\ \text{C.}\]
\[2)\ 3\frac{1}{6} + 1\frac{5}{6} = 4\frac{6}{6} = 5\ (ч) -\]
\[на\ путь\ из\ А\ в\ С.\]
\[Ответ:5\ часов.\]