Master Huang originally planned to process 480 parts in 8 hours, but actually processed 160 parts in 2 hours. With this efficiency, how many hours can it be completed in advance? how many hours
黄师傅原计划8小时加工零件480个，实际2小时加工160个，照这样的效率，可以提前几个小时完成？多少小时
<gadget id="calculator">160 / 2</gadget>
<output>80</output>

<gadget id="calculator">480 / 80</gadget>
<output>6</output>

<gadget id="calculator">8 - 6</gadget>
<output>2</output>

<result>2</result>