A grain processing plant uses two flour mills to grind 17,280 kilograms of flour at the same time. The first flour mill grinds 364 kilograms per hour, and the second mill grinds 356 kilograms per hour. If you work 8 hours a day, you can finish the grinding How many days does it take?
粮食加工厂用两台磨面机同时磨面17280千克，第一台磨面机每小时磨面364千克，第二台磨面机每小时磨面356千克，如果每天工作8小时，磨完这些面需要多少天？
<gadget id="calculator">364 + 356</gadget>
<output>720</output>

<gadget id="calculator">720 * 8</gadget>
<output>5_760</output>

<gadget id="calculator">17_280 / 5_760</gadget>
<output>3</output>

<result>3</result>