The road construction team wants to build a road with a length of 1km and a width of 6m, and pave it with 30cm thick composite soil. How much m**3 of composite soil is needed at least?
修路队要修一条长1km、宽6m的公路，铺30cm厚的三合土，至少需要三合土多少m**3？
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 * 1_000 * 6 * (3/10)</gadget>
<output>1_800</output>

<result>1_800</result>