A project is completed by Team A in 40 days alone, and by Team B in 60 days. The two teams worked together for 10 days, how much of the project is left unfinished?
一项工程由甲队独做40天完成，由乙队独做60天完成．两队合做10天，还剩下这项工程的几分之几没有完成？
<gadget id="calculator">1 / 40</gadget>
<output>1/40 = around 0.025</output>

<gadget id="calculator">1 / 60</gadget>
<output>1/60 = around 0.016667</output>

<gadget id="calculator">(1/40) + (1/60)</gadget>
<output>1/24 = around 0.041667</output>

<gadget id="calculator">(1/24) * 10</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">1 - (5/12)</gadget>
<output>7/12 = around 0.583333</output>

<result>7/12 = around 0.583333</result>