It takes team A 8 days to dig a canal, and team B 12 days to complete it. How many days can teams A and B work together to dig half of the canal?
挖一条水渠，甲队要8天完成，乙队要12天完成，甲乙两队合作多少天可以挖完这条水渠的一半．
<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>