Burning 1Hour Fuses in 45 Minutes (Math Chat)
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Frank Morgan, MAA Online  
You have two onehour fuses: lighting one end of a fuse will cause it to burn down to the other end in exactly one hour's time. You know nothing else about the fuses; in particular you don't know how long any segment of a fuse will burn, only that an entire fuse takes one hour. How can you tell when exactly 45 minutes have passed? Answer: This is possible, but it takes two good ideas...  


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