You are trying to fill a bath with both taps on, but have accidentally left out the plug. Normally the hot water tap takes 8 min

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问题 You are trying to fill a bath with both taps on, but have accidentally left out the plug. Normally the hot water tap takes 8 minutes to fill the hath and the cold water tap takes 10 minutes. However, the water empties out through the plug hole in 5 minutes. How long will it take for the bath to fill?

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答案40 minutes

解析 (设浴缸容量为X，n为三管一起开的充满水的时间，热水充满浴缸要8分钟，所以每分钟充满x／8，同理冷水每分钟充满x／10，而放水管每分钟放水x／5，故可列方程(x／8+x／10—x／5)×n=x，解得n=40，即需40分钟。)

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本试题收录于： B类竞赛（英语专业本科专科）题库大学生英语竞赛（NECCS）分类

B类竞赛（英语专业本科专科）

大学生英语竞赛（NECCS）

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