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khongthithanhha1975
2 năm trước
Giúp em đi mà các anh các chị ơi,em tuyệt vọng quá rồi Quãng đường AB dài 120km,lúc 7h sáng một xe máy đi từ A đén B.Đi được 3/4 quãng đường thì xe bị hỏng phải dừng lại 10 phút để sửa rồi đi tiếp với vận tốc kém vận tốc ban đầu 10km/h.Biết xe máy đến B lúc 11h30 trưa cùng ngày.Giả sử vận tốc xe máy trên 3/4 quãng đường đầu không đổi và vận tốc xe máy trên 1/4 quãng đường sau cũng không đổi.Hỏi xe máy bị hỏng lúc mấy giờ.
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