The inner circumference of a runway is 400 meters, R=44m, r=40m. If a 400-meter race is to be run, the starting point is set in the straight track and the end point is the same, how many meters apart should the starting points of the two runways be?
一个跑道的内侧周长是400米，R=44m，r=40m，如果要进行400米跑步比赛，起点设在直道内，且终点相同，那么两条跑道的起点要相距多少米？
<gadget id="calculator">44 - 40</gadget>
<output>4</output>

<gadget id="calculator">3.14 * 4 * 2</gadget>
<output>25.12</output>

<result>25.12</result>