16. Burning Candles Challenge You have two identical candles. When lit at one end, each candle burns completely in exactly one hour.Using only these two candles and a means to light them, how can you burn both candles entirely in just 45 minutes? Added 4 October 2011 · Updated 9 July 2026 Show Hint Show Solution Hint: Consider how you can use both candles simultaneously. Solution: Begin by lighting Candle A at both ends and Candle B at only one end. Because Candle A is burning from both ends, it will be consumed in 30 minutes.When Candle A goes out, immediately light the unused end of Candle B. Half of Candle B (30 minutes’ worth) now remains, but it is burning from both ends, so it will last only 15 minutes.The total time elapsed is 30 + 15 = 45 minutes, and both candles have been fully burned.
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