2. From head to tail of the zebra Hippotigris - 360 stripes of the same width. Flea Masha and flea Dasha started crawling from the head of the zebra to its tail. At the same time, flea Sasha started crawling from the tail to the head. Flea Dasha crawls twice as fast as flea Masha. Before meeting flea Sasha, Masha overcame exactly 180 stripes. How many stripes will flea Dasha overcome before she meets flea Sasha?
Solution: 240 stripes.

Mashka crawled half of the zebra. Let her speed be $v$, then the closing speed of Mashka and Sashka is $2v$, and the closing speed of Dashka and Sashka is $3v$. Therefore, Sashka will crawl $3/2$ times fewer stripes before meeting Dashka than before meeting Mashka, i.e., 120 stripes. The remaining 240 stripes will be crawled by Dashka.