5 11:15 93 31=

$$1\frac{51}{93} : 1\frac{5}{31} = \frac{1 \cdot 93 + 51}{93} : \frac{1 \cdot 31 + 5}{31} = \frac{144}{93} : \frac{36}{31} = \frac{144}{93} \cdot \frac{31}{36} = \frac{144 \cdot 31}{93 \cdot 36} = \frac{4464}{3348} = \frac{4}{3}$$

Ответ: $$\frac{4}{3}$$