It takes 8 days for A to complete a project alone, and 1/4 of the project can be completed by B alone in 3 days. If A and B cooperate, how many days can they complete the work.
一项工程，甲单独完成要8天，乙单独做3天可完成这项工程的(1/4)，如果甲、乙两人合作，则多少天可以完成这项工作．
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

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

<gadget id="calculator">(1/4) / 3</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>