To build a water canal, team A alone can finish it in 8 days, and team B can finish it alone in 10 days. How many days will it take for teams A and B to work together to complete the canal?
修一条水渠，甲队单独修8天修完，乙队单独修10天修完，甲乙两队合作几天修完全这条水渠？
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(1/8) + (1/10)</gadget>
<output>9/40 = around 0.225</output>

<gadget id="calculator">1 / (9/40)</gadget>
<output>40/9 = around 4.444444</output>

<result>40/9 = around 4.444444</result>