The length of W'X' is 12 units.
For given question,
The Preimage of the dilation is rectangle WXYZ
The image formed after the dilation is W'X'Y'Z'
We need to find the measure of W'X'
The probable rule for the dilation obtained from a similar question is 
The center of dilation is the vertex Z
The scale factor of the dilation is 12/5
⇒ W'X' = (12/5) × WX
The length of W X is 5
⇒ W'X' = (12/5) × WX
⇒ W'X' = (12/5) × 5
⇒ W'X' = 12 units
Therefore, the length of W'X' is 12 units.
Learn more about dilation transformation here:
brainly.com/question/8849187
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