Применим теорему синусов:
$$\frac{XT}{sin(\angle N)} = \frac{NT}{sin(\angle X)}$$
$$NT = \frac{XT \cdot sin(\angle X)}{sin(\angle N)} = \frac{46\sqrt{2} \cdot sin(30°)}{sin(45°)} = \frac{46\sqrt{2} \cdot \frac{1}{2}}{\frac{\sqrt{2}}{2}} = 46\sqrt{2} \cdot \frac{1}{2} \cdot \frac{2}{\sqrt{2}} = 46$$
Ответ: 46