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djtconmemay
2 năm trước
.Quãng đường Hà Nội – Nam Định dài 130 km, lúc 7 giờ 20 phút một xe máy đi từ Hà Nội đi Nam Định với vận tốc 45 km/giờ, cùng lúc đó một ô tô đi từ Nam Định về Hà Nội với vận tốc 55 km/giờ. Hỏi: a/ Sau bao lâu ô tô và xe máy gặp nhau? b/ Ô tô gặp xe máy lúc mấy giờ?
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