In the diagram, the length of segment TQ is 40 units. Line m is a perpendicular bisector of line segment S Q. It intersects line segment S Q at point R. Line m also contains points T and V. Line segment T S is 2 x + 8. Line segment S V is 3 x minus 4. What is the length of segment QV?
32 units
36 units
40 units
44 units