Master Chen processed 221 parts, and processed 78 parts in 6 hours. According to this calculation, how many hours will it take to complete the task?
陈师傅加工221个零件，6小时加工了78个零件，照这样计算，还要加工几小时才能完成任务？
<gadget id="calculator">221 - 78</gadget>
<output>143</output>

<gadget id="calculator">78 / 6</gadget>
<output>13</output>

<gadget id="calculator">143 / 13</gadget>
<output>11</output>

<result>11</result>