and B cooperate to complete a job. Due to the good cooperation, A's work efficiency is increased (1/10) compared with that done alone, and B's work efficiency is increased (1/5) compared with that done alone. A and B cooperate for 6 hours If A alone takes 11 hours to complete the work, how many hours does B alone need to do it?
甲、乙合作完成一项工作，由于配合的好，甲的工作效率比单独做时提高(1/10)，乙的工作效率比单独做时提高(1/5)，甲、乙合作6小时完成了这项工作，如果甲单独做需要11小时，那么乙单独做需要几小时？
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 / 11</gadget>
<output>1/11 = around 0.090909</output>

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

<gadget id="calculator">1 + (1/10)</gadget>
<output>11/10 = around 1.1</output>

<gadget id="calculator">(1/11) * (11/10)</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 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">(1/15) / (6/5)</gadget>
<output>1/18 = around 0.055556</output>

<gadget id="calculator">1 / (1/18)</gadget>
<output>18</output>

<result>18</result>