A project can be completed by team A alone in 8 days and by team B in 12 days. How much of the project can be completed in two days by the cooperation of teams A and B?
一项工程，甲队单独做需要8天完成，乙队单独做需要12天完成．甲、乙两队合作，两天可以完成这项工程的几分之几？
<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">(5/24) * 2</gadget>
<output>5/12 = around 0.416667</output>

<result>5/12 = around 0.416667</result>