The runway of the school playground is about 200 meters. Carry out a 200-meter race, that is, run 1 lap, and the track is 1 meter wide. How many meters should the starting line of the second pass be before the starting line of the second pass (the innermost track).
学校运动场的跑道约是200米．进行200米的赛跑，即跑1圈，跑道宽1米，第二道次的起跑线该在弟一道次(最内道)起跑线前多少米．
<result>6.28</result>