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Winsow2011
2 năm trước
Lúc 6 giờ 30 phút , một người đi xe đạp từ A đến B với vận tốc 16km/giờ .Đến 6 giờ 45 phút cùng ngày , một người đi xe máy từ A đến B với vận tốc 36km/giờ .Hỏi : a) Xe máy đuổi kịp xe đạp lúc mấy giờ ? b)khi xe máy đến B thì xe đạp còn cách B bao nhiêu km (biết rằng xe máy đến B lúc 7 giờ 30 phút cùng ngày )
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