A project can be completed in 10 days by team A alone, and by team B in 15 days. If teams A and B work together for 2 days, how much of the project can be completed?
一项工程，甲队独做需10天竟成，乙队独做需15天完成．如果甲、乙两队合做2天，能完成这项工程的多少．
<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

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

<gadget id="calculator">(1/15) + (1/10)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(1/6) * 2</gadget>
<output>1/3 = around 0.333333</output>

<result>1/3 = around 0.333333</result>