The playground of an elementary school has a circle of 200 meters and a road width of 1.5 meters. The events of the Summer Games include a 400-meter run, that is, two laps. How many meters should the starting line be advanced in turn?
某小学的运动场一圈为200米，道宽为1.5米．夏季运动会的项目有400米跑，即跑两圈，起跑线该依次提前多少米？
<gadget id="calculator">2 * 3</gadget>
<output>6</output>

<gadget id="calculator">6 * 3.14</gadget>
<output>18.84</output>

<result>18.84</result>