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Brainteaser #44- Measuring Time -

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Puzzle Image You have two ropes of equal length and a book of matches. If you were to light the end of one of the ropes, it would burn for exactly one hour. By lighting the ropes in different ways, it is possible to measure different lengths of time. One hour is one example of a length of time that can be measured. How many different lengths of time in all can potentially be measured with the two ropes?

A couple of rules/restrictions:
1. You may not use scissors.
2. The rope is too rigid to be folded in half.
3. You can not tell by eye where the half way point of the string is.
Do you have a suggestion for this puzzle (e.g. something that should be mentioned/clarified in the question or solution, bug, typo, etc.)?
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