Two guards are overseeing the order in a room whose shape and dimensions are shown in the diagram. Each two adjacent walls are perpendicular to each other, and the dimensions are given in meters. The guards stand close to the wall at the locations marked with squares. Together, they can oversee the entire room, but only a part of the room can be overseen by both at the same time.

a) Mark the part of the room that both guards can oversee in the diagram.

b) How many times larger is the entire room compared to the part that both guards can oversee.

(K. Pazourek)

![](https://cdn.mathpix.com/cropped/2024_04_17_8b8f2fdcb46700a46ac3g-2.jpg?height=728&width=731&top_left_y=1806&top_left_x=662)