Câu 12: Quãng đường AB dài 120 km. Một ôtô đi từ A đến B với vận tốc 68 km/giờ, cùng lúc đó một xe đạp đi từ B đến A với vận tốc 12 km/giờ. Hỏi từ lúc bắt đầu đi sau mấy giờ ô tô gặp xe đạp? * 5 điểm 1 giờ 30 phút 1giờ 10phút 1 giờ 15 phút 1 giờ 20 phút

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