Two candles of the same length, the thick candle can burn for 4 hours, the thin candle can burn for 3 hours, a power outage, light the two candles at the same time, blow them out at the same time after the power comes in, it is found that the length of the thick candle is twice that of the thin candle, Ask for the time of the power outage? (solution by equation)
两根同样长的蜡烛，粗蜡烛可燃烧4个小时，细蜡烛可燃烧3个小时，一次停电，同时点燃两根蜡烛，来电后同时吹灭，发现粗蜡烛的长是细蜡烛的2倍，求停电的时间？(用方程解)
<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>