A cuboid pool is 12 meters long and 10 meters wide. The water depth in the pool is 3.14 meters. There is a water pipe at the bottom of the pool with an inner diameter of 2 decimeters. Run out of water?
一个长方体水池，长12米，宽10米，池中水深3.14米，池底有一根水管，内直径2分米，放水时，水流速度为每秒2米，放多长时间能把池中的水放完？
<gadget id="calculator">12 * 10 * 3.14</gadget>
<output>376.8</output>

<gadget id="calculator">0.2 / 2</gadget>
<output>0.1</output>

<gadget id="calculator">0.1 ** 2</gadget>
<output>0.01</output>

<gadget id="calculator">3.14 * 0.01 * 2</gadget>
<output>0.0628</output>

<gadget id="calculator">376.8 / 0.0628</gadget>
<output>6_000</output>

<result>6_000</result>