The inner diameter of the water pipe is 2 cm, and the flow rate of water in the pipe is 10 cm per second. A student goes to the pool to wash his hands and forgets to turn off the tap when he leaves. How many liters of water is wasted in 5 minutes.
自来水管的内直径是2厘米，水管内水的流速是每秒10厘米，一位同学去池边洗手，走时忘记关掉水龙头，5分钟大约浪费水多少升．
<gadget id="calculator">2 / 2</gadget>
<output>1</output>

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

<gadget id="calculator">1 * 1_000</gadget>
<output>1_000</output>

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

<gadget id="calculator">3.14 * 1 * 10 * 5 * (3/50)</gadget>
<output>9.42</output>

<result>9.42</result>