Question: These two explorers fell into a pit that was 20 miles deep. They climbed up 3 miles during the day but fell back down 2

These two explorers fell into a pit that was 20 miles deep. They climbed up 3 miles during the day but fell back down 2 miles while they were sleeping. This happened every day until they eventually got out. How many days did it take them to get out.

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