Note: Figure not drawn to scale.

In the figure shown, points Q, R, S, and T lie on line segment PV, and line segment RU intersects line segment SX at point W. The measure of $\angle SQX$ is $40^{\circ }$, the measure of $\angle SXQ$ is $90^{\circ }$, the measure of $\angle SWU$ is $70^{\circ }$, and the measure of $\angle VTU$ is $170^{\circ }$. What is the measure, in degrees, of $\angle TUR$?