A job can be completed in 6 days by A alone, and 8 days by B alone. If B does 2 days first and then A alone, how many days will it take to complete?
一件工作，甲独做需6天完成，乙独做需8天完成，若乙先做2天，再甲独做，还需几天完成？
<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>