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1.Một mô tô chạy với vận tốc 25km/giờ. Mô tô đi từ A đến B hết 3 giờ. Hỏi cũng quãng đường AB, một ô tô chạy mất 1,5 giờ thì vận tốc của ô tô là bao nhiêu? 2. Một xe máy đi từ A lúc 7 giờ 39 phút với vận tốc 36km/giờ. Đến 10 giờ 9 phút một ô tô cũng đi từ A đuổi theo xe máy với vận tốc 54km/giờ. Hỏi ô tô đuổi kịp xe máy lúc mấy giờ?
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