batch of parts can be completed by the master in 6 hours alone, and by the apprentice in 10 hours. If two people work together for 3 hours, what percentage of the task can be completed?
一批零件，师傅独做6小时完成，徒弟独做要10小时．现两人合做3小时，可完成任务的几分之几？
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

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

<gadget id="calculator">(1/6) + (1/10)</gadget>
<output>4/15 = around 0.266667</output>

<gadget id="calculator">(4/15) * 3</gadget>
<output>4/5 = around 0.8</output>

<result>4/5 = around 0.8</result>