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Dat1234ht
2 năm trước
Một đoàn tàu hỏa đi từ A đến B mất 3 giờ 30 phút Nếu vận tốc của tàu hỏa giảm đi 10km/h thì tàu đến B chậm mất 1 giờ 45 phút . Tính quãng đường AB và vận tốc đoàn tàu
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