project can be completed in 8 days by A alone, and 6 days by B alone. If A works in 2 days first, and then B completes it alone, how many days will B have to work to complete it?
一项工程，甲单独做8天完成，乙单独做6天完成，如果甲先做2天，再由乙单独完成，乙还要做多少天才能完成？
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">(1/8) * 2</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

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

<gadget id="calculator">(3/4) / (1/6)</gadget>
<output>9/2 = around 4.5</output>

<result>9/2 = around 4.5</result>