It takes 18 hours to input a manuscript by Mr. Wang alone, and 12 hours by Mr. Zhao. Mr. Zhao will record for 6 hours alone, and then Mr. Wang will record the rest. How many hours will it take?
录入一份稿件王老师单独录入要用18小时，赵老师单独录入要用12小时．赵老师先单独录入6小时，剩下的再由王老师录入，还要用几小时？
<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">(1/12) * 6</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 - (1/2)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 18</gadget>
<output>1/18 = around 0.055556</output>

<gadget id="calculator">(1/2) / (1/18)</gadget>
<output>9</output>

<result>9</result>