A round table has a diameter of 1.40 meters.

For a party, the table is expanded by adding three planks, each 40 cm wide, as shown in the figure. If each person at the table should have 60 cm of space, how many guests can sit at the table?
![](https://cdn.mathpix.com/cropped/2024_05_01_30c9a294a58a6e4b8190g-022.jpg?height=282&width=536&top_left_y=350&top_left_x=1296)
The perimeter of the expanded table is

$$
140 \times \pi + 40 \times 6 \approx 140 \times 3.14 + 240 = 679.60 \text{ cm}
$$

If each guest needs $60 \text{ cm}$ of space, the maximum number of guests that can sit at the table is

$$
\frac{679.60}{60} \approx 11.3
$$

that is, 11 guests.