问题描述：
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Candle A and candle B are of the same length. Candle A, which is broader, can burn for 5 hours while Candle B, the thinner candle, can burn for 4 hours. If both candles are lighted at the same time, how long does it take for candle A to be twice as long left as candle B?
Candle A and candle B are of the same length. Candle A, which is broader, can burn for 5 hours while Candle B, the thinner candle, can burn for 4 hours. If both candles are lighted at the same time, how long does it take for candle A to be twice as long left as candle B?
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