5 1--1- 93 5 31

$$1\frac{51}{93} : 1\frac{5}{31} = \frac{1 \cdot 93 + 51}{93} : \frac{1 \cdot 31 + 5}{31} = \frac{144}{93} : \frac{36}{31} = \frac{144}{93} \cdot \frac{31}{36} = \frac{4 \cdot 36 \cdot 31}{3 \cdot 31 \cdot 36} = \frac{4}{3} = 1\frac{1}{3}$$

Ответ: 1 1/3