A rectangular lawn is 140 meters long and 100 meters wide, and there is a cement road around the lawn. How many meters is this cement road at least? Xiao Ming walks 60 meters per minute, how many minutes does it take to complete a circle?
一块长方形草坪长140米、宽100米，在草坪四周有一条水泥路．这条水泥路至少多少米？小明每分钟走60米，走完一圈至少要几分钟？
<gadget id="calculator">240 * 2</gadget>
<output>480</output>

<gadget id="calculator">480 / 60</gadget>
<output>8</output>

<result>8</result>