To make a batch of parts, A alone will take 10 hours. B can only make five-sixths of the batch of parts in the same time. Now after A and B have worked together for 3 hours, A will do the rest. How many more hours will it take?
做一批零件，甲单独做要用10小时．乙在相同的时间内只能做这批零件的六分之五．现在甲乙合做3小时后，剩下的由甲来做，还要做几小时？
<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">(5/6) / 10</gadget>
<output>1/12 = around 0.083333</output>

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

<gadget id="calculator">(1/12) + (1/10)</gadget>
<output>11/60 = around 0.183333</output>

<gadget id="calculator">(11/60) * 3</gadget>
<output>11/20 = around 0.55</output>

<gadget id="calculator">1 - (11/20)</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">(9/20) / (1/10)</gadget>
<output>9/2 = around 4.5</output>

<result>9/2 = around 4.5</result>