#198 Christmas candles
set by Paulo Ferro
Your turkey needs exactly 6 hours to slow roast. Alas, you have no timer, just three candles: one that burns in 3 hours, one that burns in 4 hours and another that burns in 5 hours.
How can you measure 6 hours using these candles, putting the roast in the oven at the same time as you light the first candle?
#198 Christmas candles
Solution
Here is one way. Light all three candles. When the 3-hour candle burns out, blow out the 4-hour candle. When the 5-hour candle burns out, relight the 4-hour …