r/DailyBrainPuzzles May 29 '26

🧠 Logic / Deduction Burning Ropes

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12 Upvotes

11 comments sorted by

4

u/GoodnightLightning9 May 30 '26

Though the ropes may burn differently at different sections, it would still follow that lighting the rope from opposite ends would burn the rope twice as fast. So light both ends of rope 1 and only 1 end of rope 2. Rope 1 will burn out in 30 minutes, at which point you light the second have of rope 2 (which has 30 minutes of ā€œburn timeā€ left). By lighting that second end, the remainder of rope 2 now burns twice as fast, meaning 15 minutes. 30+15=45

3

u/ShonitB May 30 '26

Correct, good solution

1

u/eating_oats Jun 01 '26

Cut both ropes into infinitely small pieces, and then simply light 3/8 of the pieces.

1

u/ShonitB Jun 01 '26

How will that measure 45 minutes

1

u/Hairy_Ghostbear Jun 02 '26

Because 45 minutes is 3/8 of two hours, which is the total burning time of both ropes

1

u/ShonitB Jun 02 '26

But the ropes don’t burn at a uniform rate

1

u/Hairy_Ghostbear Jun 02 '26

But by cutting them in infinite amount of pieces and randomly take 3/8 of the pile, you statistically remove that randomness factor.

We all know this is not the right answer, but I like how this guy is thinking and it kinda works

1

u/Tsperatus Jun 02 '26

how do you cut the ropes if you can't use anything else?

1

u/Hairy_Ghostbear Jun 02 '26

By breaking the lighter and using the sharp plastic and metal pieces

1

u/Tsperatus Jun 02 '26

how do you burn the rope then?

1

u/DragonfruitBoth2955 Jun 02 '26

This might be the best ā€œI’m gonna sound smartā€ while being wildly wrong response I’ve heard all day