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thuhien26082005
2 năm trước
Một ô tô đi từ tỉnh A đến tỉnh B hết 5 giờ. Trong 3 giờ đầu, mỗi giờ ô tô đi được 50 km và trong 2 giờ sau, mỗi ô tô đi được 45 km. Hỏi trung bình mỗi giờ ô tô đó đi được bao nhiêu ki- lô- mét ?
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