Toán Lớp 7: Mot oto di tu a den b voi van toc 45km/h het 3 gio 15 phut.Hoi chiec xe do chay tu A den B voi van toc 65km/h thi het bao nhieu thoi gian?
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Toán Lớp 7: Mot oto di tu a den b voi van toc 45km/h het 3 gio 15 phut.Hoi chiec xe do chay tu A den B voi van toc 65km/h thi het bao nhieu thoi gian?
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