题目内容

甲、乙两人在匀速上升的自动扶梯从底部向顶部行走，甲每分钟走的扶梯的级数是乙的2倍；当甲走了36级到达顶部，而乙则走了24级到顶部。那么，自动扶梯有多少级露在外面？（）

A. 68
B. 56
C. 72
D. 85

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