5/12 * 2/12 =

$$\frac{5}{12} \cdot \frac{2}{12} = \frac{5 \cdot 2}{12 \cdot 12} = \frac{10}{144}$$

Сократим дробь на 2:

$$\frac{10}{144} = \frac{5}{72}$$

Ответ: $$\frac{5}{72}$$