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初中数学七年级下 二元一次方程组应用题 行程问题之环形跑道问题
（中考·雅安）甲、乙两人在一环形场地上从A点同时同向匀速跑步，甲的速度是乙的2.5倍，4min后两人首次相遇，此时乙还需要跑300m才跑完第一圈. 求甲、乙两人的速度及环形场地的周长.
七年级下册 典型例题、压轴难题48/88
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