A project is completed in 10 days by the cooperation of Party A and Party B. If team A can complete the project in 15 days, how many days will team B complete it alone?
一项工程，甲乙合作10天完成．如果由甲队独做15天完成，乙队独做多少天完成．
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

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

<gadget id="calculator">(1/10) - (1/15)</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">1 / (1/30)</gadget>
<output>30</output>

<result>30</result>