There are two candles of different thickness. The length of the thin candle is twice the length of the thick candle. It takes 1 hour to light the thin candle and 2 hours to light the thick candle. Once there was a power outage, such two candles were lit at the same time. When the call came in, it was found that the remaining lengths of the two candles were the same. How long has the power outage lasted?
有粗细不同的两支蜡烛，细蜡烛的长度是粗蜡烛长度的2倍，点完细蜡烛需要l小时，点完粗蜡烛需要2小时．有一次停电，将这样两支蜡烛同时点燃，来电时，发现两支蜡烛所剩长度一样，则此次停电共停了多长时间？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<result>2/3 = around 0.666667</result>