Challenge Yourself

Even if you didn't buy the book "How Would You Move Mount Fuji?", you may still feel you're up to challenging yourself with some puzzles, brain teasers and quizzles (quiz + puzzle) that appear from time to time on job interviews.

Look no further than this site, that treats this book as it's bible. It has many such quizzles, along with solutions and a forum where people try to solve the puzzle, before a solution is posted.
Here's one to whet your appetite:

The Rope Bridge

Four people need to cross a rickety rope bridge to get back to their camp at night. Unfortunately, they only have one flashlight and it only has enough light left for seventeen minutes. The bridge is too dangerous to cross without a flashlight, and it’s only strong enough to support two people at any given time.

Each of the campers walks at a different speed. One can cross the bridge in 1 minute, another in 2 minutes, the third in 5 minutes, and the slow poke takes 10 minutes to cross. How do the campers make it across in 17 minutes?

So far I'm 3 from 5...