road roller travels 60 meters per minute, and the width of the roller is 400 cm. How much road can the road roller press for 9 minutes?
一台压路机，每分钟行驶60米，压路的宽度是400厘米．压路机行驶9分钟，能压多大的路面？
<gadget id="calculator">400 / 100</gadget>
<output>4</output>

<gadget id="calculator">60 * 4 * 9</gadget>
<output>2_160</output>

<result>2_160</result>