Answer to burning fuse puzzle

As a reminder …

You have two fuses, each of them will burn for exactly one hour. However, the rate of burning is not consistent, meaning that burning half of one of the fuses would not necessarily give half an hour.

How can you measure 45 minutes using these two fuses?

The answer …

Light one fuse at both ends and the other fuse at just one end. It will take 30 for the fuse lit at both ends to extinguish, at which point, you light the other end of the fuse you originally lit at just one end. It will then take a further 15 minutes for that fuse to extinguish… giving you 45 minutes.

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