A swimming pool is 50 meters long, 20 meters wide, and 1.8 meters deep. One outlet pipe can discharge 9 cubic meters of water per minute. How many minutes does it take to drain the entire pool?
一个游泳池长50米、宽20米、深1.8米，一根出水管每分钟可放水9立方米，需放多少分钟才能把全池的水放完？
<gadget id="calculator">50 * 20 * 1.8</gadget>
<output>1_800</output>

<gadget id="calculator">1_800 / 9</gadget>
<output>200</output>

<result>200</result>