Answer:
The scale factor is 3.
Explanation:
(IF YOU ARE READING THIS THIS IS INCORRECT, REFER TO THE COMMENTS THANK YOU, THE ACTUAL SCALE FACTOR IS 1/3 OR 0.33)
RQ on the right side is 5 and XW on the left side is 15. 15/5 = 3
This also means UV is 15 since it is a rectangle.
We can apply that to all sides and see if it works now.
RS on the right side is 8, so that means XU and WV on the left side is 24 since it is a rectangle.
24/8 is 3.
The scale factor is 3.