road roller travels 40 meters per minute, and the width of the roller is 2 meters. How much road can the road roller press for 30 minutes?
一台压路机每分钟行驶40米，压路的宽度是2米．压路机行驶30分钟，能压多大的路面？
<gadget id="calculator">40 * 2 * 30</gadget>
<output>2_400</output>

<result>2_400</result>