Thank you very much!搬运一个仓库的货物,甲单独需15小时,乙单独需12小时,丙单独需10小时.现有同样的仓库A和B,丙在A仓库,乙在B仓库同时开始搬运货物,甲开始帮丙搬运,中途又转向帮助乙搬运,最后

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