Barry has 2 candles that are both 60 centimetres long. One will last for 1 hour, and the other will last for 2 hours.
Barry lights both candles at the same time. Later, he blows them out at the same time.
The next day, Barry realises that one of the candles is half the length of the other.
Assuming they both burnt evenly, how long were they burning for?
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