There are 700 trees in total. It takes 8 days for A to plant alone, and 12 days for B to plant alone. How many days will it take for A and B to plant together?
一共有700棵树，甲单独种需要8天完成，乙单独种需要12天完成，甲、乙合作要几天才能种完？
<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>