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nhavankariga
2 năm trước
Một con tàu đi giữa A và B dọc theo một con sông. Chuyến đi từ A đến B là xuôi dòng, và chuyến đi từ B đến A là ngược dòng. Tàu phải mất 20 giờ để đi một vòng giữa A và B. Cho biết vận tốc của tàu khi ở trong nước là 30 km / h và vận tốc của dòng sông là 6 km / h. Khoảng cách giữa A và B là bao nhiêu km?
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