12.从甲地到乙地,上坡路占$\frac{1}{5}$,平坦路占$\frac{3}{8}$,其余是下坡路.小军先从甲地跑到乙地,再从乙地跑到甲地.往返一次共跑下坡路510米.甲、乙两地的距离是多少米?
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