On the annual day, the pupils of one school made the decision to decorate the building by hanging vibrant flags along the main hallway. They need to fix 27 flags spaced every 2 meters. The flag that is in the middle is where the flags are kept. Ruchi was in charge of putting up the flags. Where the flags were kept was where Ruchi kept her books. She was only able to carry one flag at once. Ruchi travels between finishing this task and getting back to her books for