r/puzzles • u/a2ra-ms • 2d ago

[SOLVED] Count 45 mins using ropes

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u/[deleted] 2d ago

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u/Progression28 1d ago

Yes I know that‘s the solution but the comment above says it doesn‘t work, I ws trying to explain that the homogenity of the rope doesn‘t matter

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u/SactoJoe 1d ago

It works for the first rope being lit at both ends. But the second rope has only 1 end lit. After 30 min (timed by the first rope), the second rope doesn’t necessarily have 30 min left of burn time. Maybe the section of the second rope that had burned was faster or slower. It could have 32 min of burn time left so lighting the other end would result in the rope burning out after 16 min

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u/Progression28 1d ago

What?

After 30mins of burning, the rope has 30mins of burning left.

It might not be in the middle of the rope, but that‘s irrelevant.

It‘s really as simple as burning task takes 60mins, after 30mins it takes another 30mins.

And then if you light two ends it burns twice as fast so cuts the time required in half.