A road roller, with a width of 2 meters and a speed of 80 meters per minute, how much road will be rolled in half an hour?
一台压路机，压路的宽度是2米，以每分钟80米的速度压路，半小时压多大的路面？
<gadget id="calculator">80 * 30 * 2</gadget>
<output>4_800</output>

<result>4_800</result>