The inner diameter of the water pipe is 2 cm, the flow rate of water in the pipe is 8 cm per second, how many liters of water can flow in 5 minutes.
自来水管的内直径是2cm，水管内水的流速是每秒8cm，5分钟可流水多少升．
<gadget id="calculator">2 / 2</gadget>
<output>1</output>

<gadget id="calculator">1 ** 2</gadget>
<output>1</output>

<gadget id="calculator">60 / 1_000</gadget>
<output>3/50 = around 0.06</output>

<gadget id="calculator">3.14 * 1 * 8 * 5 * (3/50)</gadget>
<output>7.536</output>

<result>7.536</result>