There is a project, it takes 10 days for team A to do it alone, 6 days for team A and B to do it together, how many days does it take for team B to do it alone?
有一项工程，甲队单独做需要10天，甲乙两队合做需要6天，乙队单独做需要几天？
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(1/6) - (1/10)</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">1 / (1/15)</gadget>
<output>15</output>

<result>15</result>