Fengle village dug a rectangular reservoir, 30 meters long, 20 meters wide, with an average depth of 3 meters. What is the area of the reservoir.
丰乐村挖一个长方形蓄水池，长30米，宽20米，平均深度是3米．这个蓄水池的占地面积是多少．
<gadget id="calculator">30 * 20</gadget>
<output>600</output>

<result>600</result>