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Một tàu thủy dự định đi từ bến A đến bến B nếu tàu thủy đi với vận tốc 42km/h thì đến bến B chậm hơn dự định 1 giờ. Nếu tàu thuỷ đi với vận tốc 56km/h thì đến bến B trước dự định 30 phút. Hỏi quãng đường tàu thủy đi từ bến A đến bến B dài bao nhiêu km?
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