A project can be completed by team A in 8 days and team B in 12 days. If two engineering teams, A and B, work together, how many days can they complete half of the project?
一项工程，甲工程队单独做8天完成，乙工程队单独做12天完成．甲、乙两工程队合做，多少天可以完成这项工程的一半？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</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">(1/2) / (5/24)</gadget>
<output>12/5 = around 2.4</output>

<result>12/5 = around 2.4</result>