A cone-shaped pile of sand has a base radius of 1 meter and a height of 7.5 meters. How long can a road with a width of 5 meters and a thickness of 2 cm be paved with this pile of sand?
一个圆锥形沙堆，底面半径是1米，高是7.5米，用这堆沙铺宽5米，厚2厘米的路面，能铺多长？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 ** 2</gadget>
<output>1</output>

<gadget id="calculator">(1/3) * 3.14 * 1 * 7.5</gadget>
<output>7.85</output>

<gadget id="calculator">5 * 0.02</gadget>
<output>0.1</output>

<gadget id="calculator">7.85 / 0.1</gadget>
<output>78.5</output>

<result>78.5</result>