conical pile of sand has a base radius of 5 meters and a height of 3 meters. If the pile of sand is paved into a road with a width of 4 meters and a thickness of 25 centimeters, how many meters can it be paved?
一个圆锥形沙堆，底面半径5米，高3米，把这堆沙铺成一条宽4米，厚25厘米的路，能铺多少米？
<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">4 * (1/4)</gadget>
<output>1</output>

<gadget id="calculator">(1/3) / 1</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">3.14 * 25 * 3 * (1/3)</gadget>
<output>78.5</output>

<result>78.5</result>