修建一条道路,甲队单独修建6天可以完成,而乙队每天可修建80米,如果甲、乙两队同时修建,3天可以完成总工程的2/3,这条道路全长是多少米?A.1440 ...

作者: tihaiku 人气: - 评论: 0
问题 修建一条道路,甲队单独修建6天可以完成,而乙队每天可修建80米,如果甲、乙两队同时修建,3天可以完成总工程的2/3,这条道路全长是多少米?
选项 A.1440 B.1380 C.1200 D.1170
答案 A
解析 甲、乙两队的效率和为3(2)3=9(2)乙队的效率为9(2)﹣6(1)=18(1)亩,即乙队修完这条道路需要18天.则这条道路全长是8018=1440米。

相关内容:道路,甲队,乙队,两队,同时,工程,全长,A.1440

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