For two candles of the same length, the thick candle can burn for 4 hours, and the thin candle can burn for 3 hours. Once there is a power outage, two candles are lit at the same time, and they go out at the same time after the power is turned on. The length of the remaining thick candle is twice the length of the remaining thin candle. , Find the power outage time.
长度相同的两支蜡烛，粗蜡烛可以燃烧4小时，细蜡烛可以燃烧3小时，一次停电，同时点燃了两支蜡烛，来电后同时熄灭，剩余的粗蜡烛长度是剩余的细蜡烛长度的2倍，求停电时间．
<gadget id="calculator">2 - 1</gadget>
<output>1</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">2 * (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(2/3) - (1/4)</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">1 / (5/12)</gadget>
<output>12/5 = around 2.4</output>

<result>12/5 = around 2.4</result>