A project can be completed in 8 days alone, and B can be completed in 12 days alone. How many days will A and B cooperate to complete the project?
一项工程甲独做8天完成，乙独做12天完成．甲乙合作多少天完成这项工程．
<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 / (5/24)</gadget>
<output>24/5 = around 4.8</output>

<result>24/5 = around 4.8</result>