road roller travels 100 meters per minute, and the width of the front wheels of the road roller is 20 decimeters. How many square meters can the road be flattened by this road roller for 40 minutes?
一辆压路机，每分钟行驶100米，压路机的前轮宽度是20分米．这辆压路机压路40分钟，可以压平路面多少平方米？
<gadget id="calculator">20 / 10</gadget>
<output>2</output>

<gadget id="calculator">100 * 2 * 40</gadget>
<output>8_000</output>

<result>8_000</result>