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Thursday, April 8, 2010

Candle Puzzle Interview Question


Ques: Suppose you have two candles, One candle takes 90 minute to burn completely? How will you measure 135 minutes using these two candles?

Ans: burn one candle completely and then burn another candle from both sides.

90 + 90/2 = 135 minutes


  1. This answer assumes that a candle will burn at the same rate on its side as it will when upright. That is a foolish assumption to make. It would be better to phrase the question as a couple of "ropes" instead of "candles" because then the answer won't be making that assumption.

  2. You are right, but candle question is also very popular in interview.


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