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thuynga7229
1 năm trước
AI GIẢI HỘ VỚI Ạ CẢM ƠN TRƯỚC :(( Quãng đường AB dài 90km.1 người đi xe máy từ A->B người đó nghỉ 30 phút rồi quay về A với vận tốc lớn hơn vận tốc lúc đầu là 9km/h.Thời gian bắt đầu đi từ A->B rồi quay về A là 5h.Tính vận tốc xe máy lúc đi từ A->B
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