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Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 發問中 
数学题！尽快给我答案！谢谢！
Jul 31st 2013, 08:04

在一个平静的河里，大力用了12分钟游到终点（根河水反方向）（去）。但是他用了4分钟游到终点（根河水是同一个方向）（回）。如果他不游泳哪个河水会用几分钟把它冲回起点??（根河水是同一个方向，同一个距离）

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