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?

• 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.
• 9 years agoHelpfull: Yes(0) No(0)
• fold one string once and set it afire. it will burn in 30 minutes. fold the other string 2 times and set it afire immediately after the 1st string. it will burn in 15 minutes. total 45 minutes
• 6 years agoHelpfull: Yes(0) No(0)