A certain project can be completed by team A alone in 8 days, and by team B in 12 days. If teams A and B work together, how many days can it be completed?
某项工程，甲队单独做8天完成，乙队单独做12天完成，如果甲、乙两队合作，多少天能完成．
<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>