A runway is 500 meters long. The tortoise and the hare start from the beginning of the runway at uniform speeds. When the tortoise reaches (1/5) of the runway, the rabbit has already reached the end of the runway. Then the hare goes back and walks towards the tortoise, runs to the finish line after meeting the tortoise, and runs towards the tortoise after reaching the finish line...until the tortoise reaches the finish line. How many meters has the rabbit run since it started?
一条跑道长500米，乌龟和兔子分别以均匀的速度从跑道的起点出发，当乌龟跑到这条跑道的(1/5)处时，兔子已经到达跑道的终点．然后兔子返回与乌龟相向而行，遇到乌龟后再跑向终点，到达终点后再与乌龟相向而行…直到乌龟到达终点．兔子从出发开始，一共跑了多少米？
<gadget id="calculator">5 / 1</gadget>
<output>5</output>

<gadget id="calculator">500 * 5</gadget>
<output>2_500</output>

<result>2_500</result>