Ответ:

\(3\frac{1}{6}=\frac{19}{6}\), \(1\frac{5}{8}=\frac{13}{8}\).

\(\frac{19}{6}-\frac{13}{8}=\frac{76}{24}-\frac{39}{24}=\frac{37}{24}=1\frac{13}{24}\).

Ответ: б) \(1\frac{13}{24}\).