Interview Preparation Exam > Interview Preparation Notes > Puzzles for Interview > The Burning Candles
The Burning Candles | Puzzles for Interview - Interview Preparation PDF Download
Introduction
In this puzzle, we are given two candles that burn unevenly in different parts and a box of matches. Our task is to measure 45 minutes and 15 minutes using these two candles.
Step 1
The first candle should be lit from both ends, while the second candle should be lit from only one end. The first candle will burn fully in 30 minutes, leaving 30 minutes to burn the second candle.
Step 2
After 30 minutes, the second candle will be halfway burned. Now light the second end of the second candle, and it will be burned completely in 15 minutes.
Solution
- Candle 1: As we lit both ends of the first candle, it completely burned in 30 minutes.
- Candle 2: After 30 minutes, the second candle will be half burned. Now, light the second end also, and it will be burned completely in 15 minutes.
Conclusion
The time taken for both candles to burn completely is equivalent to 45 minutes (30+15) and the time taken for the second candle to burn completely when lit from both ends is 15 minutes.
In summary, by lighting both ends of one candle and one end of the other candle, we can measure 45 minutes and 15 minutes.
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Sep 23, 2025
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