单选题:A、B两个港口相距48千米,无动力小木筏从A港漂流到B港需要24小时。现有一静水速度为l4千米/d,时的轮船从A港出发,

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题目内容:
A、B两个港口相距48千米,无动力小木筏从A港漂流到B港需要24小时。现有一静水速度为l4千米/d,时的轮船从A港出发,来回A、B两港两次,已知该轮船每在港口停靠一次,速度提升4千米/小时,问该轮船共行驶了多少小时?( ) A. 8
B. 10
C. 12
D. 24
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