A grain processing factory needs to grind 20,000kg of flour and 6,000kg of flour in 3 hours. According to this calculation, how many hours will it take to grind the remaining flour?
一个粮食加工厂要磨面粉20000kg，3小时磨面6000kg，照这样计算，磨完余下的面粉共要多少小时？
<gadget id="calculator">20_000 - 6_000</gadget>
<output>14_000</output>

<gadget id="calculator">6_000 / 3</gadget>
<output>2_000</output>

<gadget id="calculator">14_000 / 2_000</gadget>
<output>7</output>

<result>7</result>