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2 năm trước
Một người đi xe đạp từ A đến B với vận tốc 9km/h. Khi từ B trở về A, người đó chọn con đường khác để đi dài hơn con đường cũ 6km. Vì đi với vận tốc 12km/h nên thời gian về ít hơn thời gian đi 20 phút. Tính độ dài quãng đường AB ( Có lập bảng ạ ) Cám ơn mọi người
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