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duong20ps101
2 năm trước
Lúc 7h, 2 bạn cùng xuất phát từ 2 địa điểm. Bạn An đi từ A đến trường với vận tốc v1=12km/h. Bạn Bình đi từ B đến trường với vận tốc 8km/h. Biết khoảng cách từ A đến B là 9km. a) Sau bao lâu 2 bạn gặp nhau ở trường cùng lúc? b) Thời điểm gặp nhau của 2 bạn là mấy giờ? c) Vị trí nhà bạn An và bạn Bình cách trường bao nhiêu km?
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