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2 năm trước
Vận tốc nước chảy cùng một dòng sông là 18 m/ Phút . Một người bơi xuôi dòng 800 m hết 8 phút . Cũng vố vận tốc như vậy , người đó ngược dòng hết đoạn sông 800m đó trong thời gian :
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