Master Li plans to produce 450 parts. After 8 hours of work, there are still 330 parts left unfinished. At this speed, how many hours will it take to complete the task?
李师傅计划生产450个零件，工作8小时后还差330个零件没有完成，照这样速度，共要几小时完成任务？
<gadget id="calculator">450 * 8</gadget>
<output>3_600</output>

<gadget id="calculator">450 - 330</gadget>
<output>120</output>

<gadget id="calculator">3_600 / 120</gadget>
<output>30</output>

<result>30</result>