Answer: 98 millimeters
Step-by-step explanation: Since angle VTY is congruent to angle VTK, segment TY bisects angle VTK. Since Y is on segment VK, between V and K, we can use the Angle Bisector Theorem, which states that

(1)
Since x= VK = VY + YK, we need to obtain VY since YK = 68.
VY is obtained by multiplying the denominator YK on both sides of equation (1). So,

Hence,
x = VK = VY + YK
x = 30 + 68
x = 98 millimeters