Once upon a time, there was a castle on a square island. The entire island was surrounded with a 14m wide trench. The Romans had wanted to invade the castle and had brought a few wooden planks along with them to facilitate themselves in crossing the moat. The planks were however found to be only 13m long.
The Romans still managed to cross the trench. How did they do it?
They managed to cross the trench by placing the planks as it is shown in the picture.
