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phin1280
2 năm trước
Một cano đi xuôi từ A đến B cùng lúc một người đi bộ cũng đi từ A đến B. Cano đi được 24 km rồi quay lại được một lúc thì gặp người đi bộ tại điểm cách A 8 km. Tính vận tốc của cano khi nước yên lặng biết vận tốc dòng nước và người đi bộ đều bằng 4km/h
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