Build a wall with a length of 30m, a width of 0.3m, and a height of 5m. What is its volume in cubic meters?
砌一道长30m、宽0.3m、高5m的墙，它的体积是多少立方米？
<gadget id="calculator">30 * 0.3 * 5</gadget>
<output>45</output>

<result>45</result>