A certain job can be completed by A alone in 15 days. Now A has another task after 6 days of work, and the rest of the work is completed by B, which took 8 days. How many days will it take if all the work is done by B alone?
某项工作，甲单独干15天可完成．现甲做了6天后另有任务，剩下的工作由乙完成，用了8天．若这项工作全部由乙单独完成需多少天．
<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">(1/15) * 6</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(3/5) / 8</gadget>
<output>3/40 = around 0.075</output>

<gadget id="calculator">1 / (3/40)</gadget>
<output>40/3 = around 13.333333</output>

<result>40/3 = around 13.333333</result>