TED-Ed: Can you solve the bridge riddle? - Alex Gendler

In a remote mountain lab, a group must escape mutant zombies by crossing a rope bridge. The group includes a janitor, lab assistant, and professor, each with different crossing speeds. The bridge holds two people at a time, and a lantern is needed to see. The solution involves strategic crossings to ensure everyone escapes before zombies arrive. The fastest return with the lantern, allowing the slowest to cross together, optimizing time. The plan succeeds just in time, highlighting the importance of strategic planning.

What was the time limit before the zombies would catch up to the group?

What did the protagonist decide to do after the escape?