Up for a challenge? Try this brain teaser and see if you can crack it!
How can you measure exactly 45 minutes using 2 ropes brainteaser?
You have two ropes. Each rope has the property that if you light it on fire at one end, it will take exactly 60 minutes to burn completely. However, the ropes do not burn at a consistent rate (e.g., half the rope doesn’t necessarily burn in 30 minutes).
Using these two ropes and a way to light them, how can you measure exactly 45 minutes?
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The Three Way Light Bulb Brainteaser
Solution of 2 burning ropes brainteaser:
- Light Rope 1 from both ends: This will cause Rope 1 to burn completely in 30 minutes (since burning from both ends makes it burn twice as fast).
2. Start burning Rope 2 at the same time: Rope 2 will take 60 minutes to burn completely if lit from one end.
3. When Rope 1 finishes burning (30 minutes later), immediately light the other end of Rope 2: Rope 2 will now only have 30 minutes of rope left to burn, so when you light both ends, it will take only 15 more minutes. This way, you can measure 45 minutes(30 minutes from rope 1 and remaining 15 minutes from rope 2)
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