A runway with a lap length of 400 meters is 1.5 meters wide. How many meters should the starting line be advanced in sequence?
一圈为400米的跑道宽为1.5米，起跑线该依次提前多少米？
<gadget id="calculator">3.14 * 1.5</gadget>
<output>4.71</output>

<result>4.71</result>