A cubical box is placed along a wall, and a ladder leans against the wall so it just touches the corner of the box, as shown below.
![enter image description here](https://www.queryhome.com/puzzle/?qa=blob&qa_blobid=15462398741055602836)
If the ladder’s length is 4, and the box has a side of 1, what is the distance between the top of the box and the top of the ladder?