Answer to question #17

You have a string-like fuse that burns in exactly one minute. The fuse is inhomogeneous, and it may burn slowly at first, then quickly, then slowly, and so on. You have a match, and no watch. How do you measure exactly 30 seconds?

This is one is fairly simple if you can do it, and difficult if you can't...

There is no explanation needed here, you just...

Light the fuse at both ends!!!!

 

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