To welcome the National Day cultural performance, 560 garlands were to be made. The original plan was to make 100 garlands per hour. After 2 hours of production, it is changed to 120 per hour, how many hours will it take to complete?
迎国庆文艺汇演要制作花环560个，原计划每小时制作100个．制作2小时后改为每小时制作120个，还需要几小时才能完成？
<gadget id="calculator">100 * 2</gadget>
<output>200</output>

<gadget id="calculator">560 - 200</gadget>
<output>360</output>

<gadget id="calculator">360 / 120</gadget>
<output>3</output>

<result>3</result>