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zaragozascholl107803
2 năm trước
Một người phải đi quãng đường từ A đến B. Người đó đi xe đạp với vận tốc 10 km/h thì hết 1 giờ 48 phút. Lúc đi từ B về A người đó đi xe máy với vận tốc 36 km/h mà muốn về nhà lúc 10 giờ. Vậy người đó phải khởi hành lúc mấy giờ?
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