Here's a problem I got at interview a coule of days back:
You have two ropes and a lighter.
The ropes each take one hour to burn from end to end.
They burn unevenly i.e. half may take 5 minutes, the other half 55 minutes.
Both ropes burn differently i.e. they are not identically uneven.
How would you use those three pieces of kit and tell me the beggining and end of a 15 minute period?
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