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diep1292001
2 năm trước
Một người đi từ A đến B hết 2 giờ 30 phút. Trong nửa thời gian đầu người đó bằng xe đạp với vận tốc 13km/giờ, trong nửa thời gian sau người đó đi bằng ô tô với vận tốc gấp 4 lần vận tốc đi bằng xe đạp. Tính độ dài quãng đường AB.
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