When I first started doing these, they really opened my eyes.  Despite sounding nerdy, I was really excited when I first attempted these questions.2`(CUWC~

3d@;fUBZ^jYou have two ropes. You know that each rope takes one hour to burn from one end to the other, but that the burning does not take place at a constant rate (for example, half the rope may burn in one minute, and the other half will take 59 more minutes to burn).
,IW#I#FWHow would you go about measuring a 45 minute time interval with just these two ropes?
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try to time yourself and see how long you need.....
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This one is difficult.  Is any formular or calculation required?  May I see the answer, please? It seems no one attempts to give an answer!