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leminhnguyet1904
2 năm trước
Nam khởi hành bằng xe đạp từ A đến B. Sau đó 30 phút, Bảo cũng xuất phát từ A đến B bằng xe máy. Vận tốc xe máy gấp 2 lần vận tốc xe đạp nên Bảo đến B cùng lúc với Nam. Tìm vận tốc mỗi xe biết quãng đường AB dài 15 km.
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