选择题：甲、乙、丙三人沿着环形操场跑步，乙与甲、丙的方向相反。甲每隔19分钟追上丙一次，乙每隔5分钟与丙相遇一次。如果甲与乙的速度比为5：4，那么甲的速度是丙的速...

题目内容：

甲、乙、丙三人沿着环形操场跑步，乙与甲、丙的方向相反。甲每隔19分钟追上丙一次，乙每隔5分钟与丙相遇一次。如果甲与乙的速度比为5：4，那么甲的速度是丙的速度的多少倍?

A.1．28 B.1．6 C. 2 D.2.5

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