This is a very old puzzle (old puzzles are old because they remain new, otherwise they’d just be forgotten puzzles) given a fresh lease of life with some computer animation. The rules are simple enough; to get all the people across the bridge in the minimum time. The full rules are on the Crossing the Bridge page.

I would like to add one small extension to the problem. Can you come up with your own similar puzzle but with different times for each person? Given that 5 people need to cross the bridge, can you come up with a simple formula to calculate the minimum possible time from each person’s individual time?

Answers and Extensions will be posted next Wednesday.

**This is not a PMQ so feel free to discuss this puzzle in the comments section below.**

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You can also subscribe to our Bookmarks on StumbleUpon and Pinterest. Many resources never make it onto the pages of Gifted Mathematics but are stored in these bookmarking websites to share with you.

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