Guangming Lamp Factory needs to produce 950 energy-saving lamps, and has already produced 630. If the rest is calculated as 160 in 2 hours, how many hours will it take to complete the task?
光明灯管厂要生产950根节能灯管，已经生产了630根，剩下的如果按2小时生产160根算，还要几小时才能完成任务？
<gadget id="calculator">950 - 630</gadget>
<output>320</output>

<gadget id="calculator">160 / 2</gadget>
<output>80</output>

<gadget id="calculator">320 / 80</gadget>
<output>4</output>

<result>4</result>