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duccuong842000
2 năm trước
Một ca nô chạy trên 1 khúc sông từ bến A đến bến B. Khi xuôi dòng thì mất 5 giờ, khi ngược dòng thì mất 6 giờ. Tính khoảng cách từ bến A đến bến B, biết vận tốc của ca nô khi xuôi dòng hơn vận tốc của ca nô khi ngược dòng là 6km/giờ
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