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01228314066tom
2 năm trước
Một xe chuyển động từ A về B. Trong 3/4 quãng đường đầu, xe chuyển động với vận tốc 36km/h. Quãng đường còn lại xe chuyển động trong thời gian 10 phút với vận tốc 24km/h. Tính vận tốc trung bình của xe trên cả quãng đường AB.
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