There are two candles with different thicknesses. The length of the thin candle is twice that of the thick candle. It takes 1 hour to light the thin candle and 2 hours to light the thick candle. There was a power outage and the two unused candles were lit at the same time , When I called, I found that the remaining lengths of the two candles were the same. How long was the power outage?
有粗细不同的两支蜡烛，细蜡烛的长度是粗蜡烛的两倍，细蜡烛点完需1小时，粗蜡烛点完需2小时，有一次停电，将这两只未使用过的蜡烛同时点燃，来电时发现两支蜡烛所剩的长度一样，问停电多长时间？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

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