5) 1 1/8 : 2 1/12

\(1\frac{1}{8}=\frac{9}{8}\), \(2\frac{1}{12}=\frac{25}{12}\).

\(\frac{9}{8}:\frac{25}{12}=\frac{9}{8}\cdot\frac{12}{25}=\frac{27}{50}\).

Ответ: 27/50.