project can be completed in 8 days by A alone, and 12 days by B alone, how many days will it take A and B to complete one-third of the project.
一件工程，甲独做要8天完成，乙独做要12天完成，甲乙合作要多少天能完成这件工程的三分之一．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

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

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

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

<gadget id="calculator">(1/3) / (5/24)</gadget>
<output>8/5 = around 1.6</output>

<result>8/5 = around 1.6</result>