The key to solve: the planarization of spatial problems. ?

Expand the three faces of the middle wall into a plane.

Because the height of the wall is 2 meters?

So the length of the unfolded rectangle is increased by 2 * 2 = 4m, while the width is still 10m?

The shortest distance is the length of a diagonal line after expansion?

What is the shortest distance that can be easily obtained according to Pythagorean theorem?

= √ (24 2+10 2) = 26 (m)?

Jiangsu Wu Yunchao wishes you academic progress.