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The only things you possess are a lighter and
two ropes with the following property: they burn from end to end in
exactly one hour, but they do not burn regularly. Hence, for exemple
if you lit one from one end, the first half could burn in 13 minutes,
the next quarter in 2 minutes and the last quarter in 43 minutes. Also,
the two ropes do not have the same irregularities.
You should light, at the same time, one rope
at both ends, and the other at one end. When the first rope is fully
burnt (30 minutes), light the remaining end. |
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