—口水井,在不渗水的情况下,甲抽水机用4小时可将水抽完,乙抽水机用6小时可将水抽完。现用甲、乙两台抽水机同时抽水,但由于渗水,结果用了3小时才将水抽完。问...

作者: rantiku 人气: - 评论: 0
问题 —口水井,在不渗水的情况下,甲抽水机用4小时可将水抽完,乙抽水机用6小时可将水抽完。现用甲、乙两台抽水机同时抽水,但由于渗水,结果用了3小时才将水抽完。问在渗水 的情况下,用乙抽水机单独抽,需几小时抽完? A.12小时 B.13小时 C.14小时 D.15小时
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答案 A
解析

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