For a project, it takes 6 days for teams A and B to complete it together, team A takes 15 days to complete it, and how many days does it take for team B to complete it alone?
一项工程，甲乙两队合作需要6天完成，甲队做需15天完成，乙队单独做需要多少天完成？
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">(1/6) - (1/15)</gadget>
<output>1/10 = around 0.1</output>

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

<result>10</result>