A conical sandy land has a base radius of 3m and a height of 25dm. How many meters can be paved with this pile of sand on a 5m wide road with a thickness of 4mm?
一个圆锥形沙地，底面半径3m，高是25dm，用这堆沙子在5m宽的公路上铺4mm厚的路面，可以铺多少米？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">25 / 10</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">5 * 0.004</gadget>
<output>0.02</output>

<gadget id="calculator">(5/2) / 0.02</gadget>
<output>125</output>

<gadget id="calculator">(1/3) * 3.14 * 9 * 125</gadget>
<output>1_177.5</output>

<result>1_177.5</result>