The volume of a pool is 15.7dm**3. There is a water inlet pipe with an inner diameter of 2cm on the pool. After opening, the water flow rate is 10 m/min. How many minutes can the empty pool be filled with water?
一水池的容积是15.7dm**3，水池的上有个内径是2cm的进水管，打开后水流速是10米/分，问几分钟后能将空水池注满水？
<gadget id="calculator">2 / 100 / 2</gadget>
<output>1/100 = around 0.01</output>

<gadget id="calculator">(1/100) ** 2</gadget>
<output>1/10_000 = around 0.0001</output>

<gadget id="calculator">3.14 * (1/10_000) * 10</gadget>
<output>0.00314</output>

<gadget id="calculator">15.7 / 1_000 / 0.00314</gadget>
<output>5</output>

<result>5</result>