Answer:
We can use the fact that the rectangles are similar to solve this problem.
We know that the ratio of the corresponding sides of similar figures is equal.
Therefore, we can set up a proportion to solve for x:
10/4 = x/6
Cross-multiplying, we get:
10*6 = 4*x
Simplifying, we get:
60 = 4x
Dividing both sides by 4, we get:
x = 15
Therefore, the length of TU is 15.