A project, team A alone needs 10 hours, and team B alone needs 8 hours, how many hours can A and B work together to complete the project (1/4).
一项工程，甲队单独做需要10小时，乙队单独做需要8小时，甲、乙合做多少小时能做完这项工程的(1/4)．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

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

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

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

<gadget id="calculator">(1/4) / (9/40)</gadget>
<output>10/9 = around 1.111111</output>

<result>10/9 = around 1.111111</result>