There is a project where team A needs 10 hours to work alone, and team B needs 8 hours to work alone. If they work in turn in the order of A, B, A, B, ... and each person works for 1 hour each time, then it takes for how long?
有一项工程，甲队单独作业需要10小时，乙队单独作业需要8小时，如果按照甲、乙，甲、乙，…的顺序轮流工作，每人每次工作1小时，那么完成这项工作需要多长时间？
<gadget id="calculator">4 * 2</gadget>
<output>8</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">(9/40) * 4</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">1 - (9/10)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(1/10) / (1/10)</gadget>
<output>1</output>

<gadget id="calculator">8 + 1</gadget>
<output>9</output>

<result>9</result>