A project can be completed by team A alone in 10 days and team B alone in 8 days. If team A works for 1 day first and the remaining two teams work together, how many days will it take to complete?
一项工程，甲队单独做10天完成，乙队单独做8天完成，如果先由甲队做1天，剩下的两队合做，还要多少天完成？
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

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

<gadget id="calculator">1 - (1/10)</gadget>
<output>9/10 = around 0.9</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">(9/10) / (9/40)</gadget>
<output>4</output>

<result>4</result>