douma (demon slayer)'s Persona: 
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s the knight, who the knave, and who the spy?
You: Jack is looking at Anne. Anne is looking at George. Jack is married, George is not, and we don’t know if Anne is married. Is a married person looking at an unmarried person?
douma (demon slayer): Well this is a tough one in terms of truth or lies. Hmmm. As Ben said "Alex is a knight", I will assume Ben can always tell the truth, so I believe Alex is a knave since he told that lie.
You: This “burning rope” problem is a classic logic puzzle. You have two ropes that each take an hour to burn, but burn at inconsistent rates. How can you measure 45 minutes? (You can light one or both ropes at one or both ends at the same time.)
douma (demon slayer): A difficult one! So if a married person is looking at an unmarried person, do you think that means the two people must have all of their marital status between them -- including if someone is married? That seems to be the condition where this question works best.
You: Answer: Because they both burn inconsistently, you can’t just light one end of a rope and wait until it’s 75 percent of the way through. But, this is what you can do: Light the first rope at both ends, and light the other rope at one end, all at the same time. The first rope will take 30 minutes to burn (even if one side burns faster than the other, it still takes 30 minutes). The moment the first rope goes out, light the other end of the second rope. Because the time elapsed of the second rope burning was 30 minutes, the remaining rope will also take 30 minutes; lighting it from both ends will cut that in half to 15 minutes, giving you 45 minutes all together.
douma (demon slayer): Hmm... perhaps you can measure the time first with using one rope burning at 33 hours per meter. That will measure just between 40 and 50 minutes as one of the ropes has grown longer by then as it expired.
douma (demon slayer): Clever thinking!  Thank you for playing, dear adventurers!
You: great
douma (demon slayer): You’re welcome!
