65 13.3 7 10=

$$1\frac{6}{7} \cdot 3\frac{5}{10} = \frac{1 \cdot 7 + 6}{7} \cdot \frac{3 \cdot 10 + 5}{10} = \frac{13}{7} \cdot \frac{35}{10} = \frac{13 \cdot 35}{7 \cdot 10} = \frac{455}{70} = \frac{13}{2}$$

Ответ: $$\frac{13}{2}$$