When I first started doing these, they really opened my eyes.  Despite sounding nerdy, I was really excited when I first attempted these questions.}"}"A*qE
八度網上論壇1E(sIa p2s
You 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).
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U)g7GL`7WHow would you go about measuring a 45 minute time interval with just these two ropes?
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t5Y0X)Vctry 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!