It takes 8 days for A to complete a project alone, and 6 days for B to complete it alone. A works for one day first, and then A and B cooperate to complete it. How many days does B work?
一项工程，甲单独完成要8天，乙单独完成需6天，甲先干一天，然后甲乙合作去完成，乙干了几天？
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">1 - (1/8)</gadget>
<output>7/8 = around 0.875</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(1/8) + (1/6)</gadget>
<output>7/24 = around 0.291667</output>

<gadget id="calculator">(7/8) / (7/24)</gadget>
<output>3</output>

<result>3</result>