A job alone takes 12 hours, and B alone takes 8 hours. After A finishes (1/3) alone, how many hours will it take for the two to finish it together?
一件工作，甲单独做要用12小时，乙单独做要用8小时，甲单独做完(1/3)后，两人合做，还要几小时才能做完？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

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

<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">(1/12) + (1/8)</gadget>
<output>5/24 = around 0.208333</output>

<gadget id="calculator">(2/3) / (5/24)</gadget>
<output>16/5 = around 3.2</output>

<result>16/5 = around 3.2</result>