A conical gravel pile with a bottom diameter of 40 meters and a height of 1.5 meters. Use this pile of gravel to pave a road 10 meters wide, and the thickness of the gravel is 5 cm. How many meters can these gravel pave?
一个圆锥形状碎石堆，底面直径40米，高1.5米．用这堆碎石去铺一条10米宽的公路，碎石的厚度5厘米．这些碎石能铺路多少米？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">40 / 2</gadget>
<output>20</output>

<gadget id="calculator">20 ** 2</gadget>
<output>400</output>

<gadget id="calculator">(1/3) * 3.14 * 400 * 1.5</gadget>
<output>628</output>

<gadget id="calculator">10 * 0.05</gadget>
<output>0.5</output>

<gadget id="calculator">628 / 0.5</gadget>
<output>1_256</output>

<result>1_256</result>