cuboid pool is 15 meters long and 8 meters wide. The water depth in the pool is 1.2 meters. There is a discharge pipe at the bottom of the pool with an inner diameter of 0.2 meters. When the water is released, the average speed of the water flow is 2 meters per second, so how many minutes does it take to drain the water in the pool? (π takes 3)
一个长方体水池，长15米，宽8米，池中水深1.2米，池底有根放水管，内直径为0.2米．放水时，水流速度平均为每秒2米，那么放完池中的水需要多少分钟？(π取3)
<gadget id="calculator">15 * 8 * 1.2</gadget>
<output>144</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 * 0.01 * 2 * 60</gadget>
<output>3.6</output>

<gadget id="calculator">144 / 3.6</gadget>
<output>40</output>

<result>40</result>