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Question Directory
Two Fuses
You have two string-like fuses. Each burns in exactly one minute. The fuses are inhomogeneous so it may burn quickly, then slowly and so on. You have a match and no watch. How can you measure exactly 45 seconds?
Simultaneously, you light both ends of the first fuse and one end of the second fuse. When the first fuse finishes, you light the unlit end of the second fuse. The second fuse will finish when exactly 45 seconds has passed.