The 400-meter runway is 1.2 meters wide. If a 200-meter race is held on this runway, how many meters should the starting line of the 4th lane be ahead of the 1st lane?
400米的跑道道宽1.2米，若在此跑道上进行200米比赛，4道比1道起跑线要提前多少米．
<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">1.2 * 3.14 * 2 * 3</gadget>
<output>22.608</output>

<gadget id="calculator">22.608 / 2</gadget>
<output>11.304</output>

<result>11.304</result>