The school playground runway is 400 meters long, the innermost curve has a radius of 30 meters, and each runway is 1.2 meters wide. If a 200-meter race is run on this runway, how many meters should the starting lines of two adjacent runways be different from each other?
学校操场跑道全长400米，最里面弯道的半径是30米，每个跑道宽1.2米，在这个跑道上进行200米赛跑，相邻两个跑道的起跑线应该相差多少米．
<gadget id="calculator">7.356 / 2</gadget>
<output>3.678</output>

<result>3.678</result>