A road roller has a working width of 3 meters and travels 4.5 meters per minute. If the road roller travels for 15 minutes, how much area of road can it press?
一台压路机的作业宽度为3米，每分行驶4.5米，压路机行驶15分，能压多大面积的路面？
<gadget id="calculator">3 * 4.5 * 5</gadget>
<output>67.5</output>

<result>67.5</result>