Jiguang Lamp Factory needs to produce 950 energy-saving lamps, and has already produced 630. If the remaining 160 are produced in 4 hours, how many hours will it take to complete the task?
继光灯管厂要生产950根节能灯管，已经生产了630根，剩下的如果按4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 / 4</gadget>
<output>40</output>

<gadget id="calculator">320 / 40</gadget>
<output>8</output>

<result>8</result>