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nguyenvanson
2 năm trước
Lúc 5h 15 phút sáng ,một người đi xe máy chuyển động thẳng đều từ điểm A và tới điểm B cách A 125km vào lúc 7h45 phút. Tới B,xe dừng lại 30 phút rồi chuyển động thẳng đều về A với vận tốc nhỏ hơn so với lúc đi là 20km/h. Hỏi xe về tới A lúc mấy giờ ?
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