题目内容：
甲、乙、丙三人跑步比赛，从跑道起点出发，跑了20分钟，甲超过乙一圈，又跑了10分钟，甲超过丙一圈，问再过多长时间，丙超过乙一圈？
A. 30分钟 B. 40分钟 C. 50分钟 D. 60分钟
参考答案：
答案解析：
选择题：甲、乙、丙三人跑步比赛，从跑道起点出发，跑了20分钟，甲超过乙一圈，又跑了10分钟，甲超过丙一圈，问再过多长时间，丙超过乙一圈？A. 30分钟 B. 4
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