We are on the outside of a moat that surrounds the central area with water. The width of the pit is 5 meters and we have two boards of 5 meters to pass. We cannot do it using a single plank since it would fall into the pit.
How can we cross the pit using the two boards?
Extracted from the page //www.acertijosypasatiempos.com
The solution involves placing one of the boards in the corner and from there the other board to the central area as shown in the following image.