Answer:
15 units
Explanation:
UW is the midsegment of ΔVXY,
By midsegment theorem of a triangle,
"Segment joining the midpoints of two sides of a triangle is parallel to the third side and measure of midsegment is half of the length of the third side."
UW =

Since, XY = 30 units
UW =

= 15 units
Therefore, length of the midsegment UW = 15 units will be the answer.