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Interview Question

Interview Hyderābād (India)

2 candles each burning 60 mins + 1 matchstick provided

  . Calculate time of 90 mins using this

Interview Answer

2 Answers


Light the match. Then light one candle at both ends equally 30 mins of burning time. Blow match out to keep half the stub. Relight the match while the candle is near burn-out. As candle burns out, light the other candle for the remainder 60 min.

Tucker on Jun 1, 2011

Light the First candle when it comes to half light (so 30 mins) than light second one from first candle(now no need of first one) and wait till second one complete (60 mins) so, 30 + 60 = 90 mins

Ashok on Oct 9, 2014

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