A conical sand pile has a circumference of 31.4m and a height of 2.4m. Using this pile of sand to pave a 4cm thick road on a 10m wide road, how long can it be paved?
一个圆锥形沙堆，量得它的底面周长是31.4m，高2.4m．用这堆沙在10m宽的公路上铺4cm厚的路面，能铺多长？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">2 * 3.14</gadget>
<output>6.28</output>

<gadget id="calculator">31.4 / 6.28</gadget>
<output>5</output>

<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">(1/3) * 3.14 * 25 * 2.4</gadget>
<output>62.8</output>

<gadget id="calculator">10 * 0.04</gadget>
<output>0.4</output>

<gadget id="calculator">62.8 / 0.4</gadget>
<output>157</output>

<result>157</result>