Một ca nô đi xuôi dòng từ A đến B với vận tốc 15 km / giờ hết 1 giờ 30 phút . Hỏi ca nô đi nguược dòng từ B về A hết bao nhiêu thời gian biết vận tốc dòng nước là 3.75 km / giờ . giúp mình với ai làm nhanh được 5 sao và câu trả lời hay nhất

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