Answer:
x = 98 mm
Explanation:
The angle bisector divides the triangle into proportional parts.
VY/VT = KY/KT
VY = VT(KY/KT) . . . . solve for VY
What we really want is VY + KY, so we can form that sum as ...
VY +KY = KY(VT/KT) +KY
x = KY(1 +VT/KT) = (68 mm)(1 +57/129.2)
x = 98 mm