Five turtles bet on a straight-line race and at the finish line the situation was as follows: Sininha is $10 \mathrm{~m}$ behind Olguinha and $25 \mathrm{~m}$ ahead of Rosinha who is $5 \mathrm{~m}$ behind Elzinha who is $25 \mathrm{~m}$ behind Pulinha. What was the order of arrival?
Let's represent each turtle on a line, using its initial letter. We then have the following situation:

![](https://cdn.mathpix.com/cropped/2024_05_01_dbce7bc2a200e234c3e2g-29.jpg?height=225&width=1200&top_left_y=1866&top_left_x=430)

Thus, Sininha is $20 \mathrm{~m}$ ahead of Elzinha. Therefore, Pulinha is $5 \mathrm{~m}$ ahead of Sininha. The order of arrival forms the word: OPSER.