There is a manuscript, A first copied 5 hours alone, and completed (1/4) of the manuscript; B then copied 6 hours alone, completed the remaining (2/3), and then the rest was copied by two people. hours can be done?
有一份稿件，甲先单独抄5小时，完成这份稿件的(1/4)；乙接着单独抄6小时，完成了余下的(2/3)，再余下的由两人合抄还需几小时可以完成？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(3/4) * (2/3)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 - (1/4) - (1/2)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/4) / 5</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(2/3) / 6</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">(3/4) * (1/9)</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">(1/20) + (1/12)</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">(1/4) / (2/15)</gadget>
<output>15/8 = around 1.875</output>

<result>15/8 = around 1.875</result>