Problem 2. A string with a length of $5 \mathrm{~m}$ is divided into equal parts with 4 cuts. From each part, a rectangle is formed such that the length is four times greater than the width. What is the length of the rectangle in cm?
Solution. From 4 cuts of the pipe, 5 pieces are obtained, each with a length of $5: 5=1 \mathrm{~m}$. From the fact that the length is four times greater than the width, it means that the length and width together make up five equal parts. From the fact that the perimeter of each rectangle is 1 meter, it follows that one part is $1 \mathrm{~m}=100 \mathrm{~cm}: 10=10 \mathrm{~cm}$. Finally, the length of the rectangle is $40 \mathrm{~cm}$.