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hsgvan11thanhhien
2 năm trước
Một ca nô xuôi từ bến sông A đến bến sông B với vận tốc 30km/h sau đó lại ngược từ B trở về A .thời gian cuối ít hơn thời gian đi ngược 1giờ 20phút .tính khoảng cách giữa hai bên A và B .biết răng vận tốc dòng nước là 5km/h và vận tốc riêng của ca nô lúc xuôi và lúc ngược bằng nhau
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