The processing factory needs to grind 24 tons of flour. Two flour mills grind flour at the same time. A flour mill grinds 1,400 kilograms per hour, and B flour mill grinds 1,800 kilograms per hour. How long does it take to grind this batch of flour?
加工厂要磨面粉24吨，两台磨面机同时磨面，甲磨面机每小时磨1400千克，乙磨面机每小时磨面1800千克，几小时磨完这批面粉？
<gadget id="calculator">24 * 1_000</gadget>
<output>24_000</output>

<gadget id="calculator">1_400 + 1_800</gadget>
<output>3_200</output>

<gadget id="calculator">24_000 / 3_200</gadget>
<output>15/2 = around 7.5</output>

<result>15/2 = around 7.5</result>