某粮运码头,建有一个大粮囤,安有甲、丙两根进粮管道和乙、丁两根出粮管道,要灌满一粮囤,单开甲要3小时,单开丙要5小时;要流完一粮囤,单开乙要4小时,单开丁...

作者: tihaiku 人气: - 评论: 0
问题 某粮运码头,建有一个大粮囤,安有甲、丙两根进粮管道和乙、丁两根出粮管道,要灌满一粮囤,单开甲要3小时,单开丙要5小时;要流完一粮囤,单开乙要4小时,单开丁要6小时。现在囤内储有1/6囤粮,如果四管同时开,几小时后粮囤装满?(要留1/15的空间上囤盖)( )
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答案 A
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相关内容:某粮,码头,粮囤,进粮,管道,丁两根,出粮,灌满,一粮,单开甲,3小时,单开丙,5小时,流完,单开乙,4小时,单开丁

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