A cylindrical water pipe with an inner diameter of 40 cm and a water velocity of 3 meters per second. How many liters of water can flow through this pipe per minute? (1 cubic decimeter of water is 1 liter)
一根圆柱形水管，内直径为40厘米，水流速度为每秒3米．这根水管每分可流过多少升水？(1立方分米水即为1升)
<gadget id="calculator">40 / 10 / 2</gadget>
<output>2</output>

<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">3.14 * 4 * 3 * 10 * 1 * 60</gadget>
<output>22_608</output>

<result>22_608</result>