To make a batch of parts, it will take 5 days for A alone, and 6 days for B alone. After 2 days, A and B will work together. How many days will it take to complete this batch of parts?
做一批零件，甲单独做要5天，乙单独做要6天，甲队先做2天后，甲、乙再合作做，还要几天才可以完成这批零件？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/5) * 2</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(1/5) + (1/6)</gadget>
<output>11/30 = around 0.366667</output>

<gadget id="calculator">(3/5) / (11/30)</gadget>
<output>18/11 = around 1.636364</output>

<result>18/11 = around 1.636364</result>