A train carriage is a cuboid with a length of 4m, a width of 2.5m, and a height of 3m. It is filled with a cart of sand. After unloading, the sand is piled into a conical sand pile with a height of 5m. Its bottom area is How many square meters?
一节火车车厢是一个长方体，它的长是4m，宽是2.5m，高是3m，装满一车沙，卸后将沙堆成一个高是5m的圆锥形沙堆，它的底面积是多少平方米？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(1/3) * 5</gadget>
<output>5/3 = around 1.666667</output>

<gadget id="calculator">3 / (5/3)</gadget>
<output>9/5 = around 1.8</output>

<gadget id="calculator">4 * 2.5 * (9/5)</gadget>
<output>18</output>

<result>18</result>