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wincr71999
2 năm trước
Quãng đường AB dài 138,6km . Một ô tô đi từ A với vận tốc 45km/giờ , cùng lúc đó một ô tô khác đi từ B về A với vận tốc 54km/giờ . Hỏi : a, Sau mấy giờ thì hai xe gặp nhau ? b, Chỗ hai xe gặp nhau cách B bao nhiêu km ?
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