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tungnguyen14711
2 năm trước
Một người đi xe đạp từ A đến B cách nhau 24 km; Một giờ sau một người đi xe máy từ A đến B và đến B trước người đi xe đạp 20 phút. Tính vận tốc mỗi xe, biết vận tốc xe máy gấp 3 lần vận tốc xe đạp.
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