You have two strings whose only known
property is that when you light one end of either string it takes exactly one
hour to burn. The rate at which the strings will burn is completely random and
each string is different.
How do you measure 45 minutes?
Give up?
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your cursor between the asterisks for the answer
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Light both the ends of the first string and one end of the
second string. 30 minutes will have passed when the first string is fully
burned, which means 30 minutes have burned off the second string. Light the end
of the second string and when it is fully burned, 45 minutes will have passed.
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