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boynghiass123
2 năm trước
Một người đi xe máy từ thành phố thanh hoá và thành phố vinh.Nếu chạy với vận tốc 25km/h thì sẽ muộn so với dự định 2 giờ .Nếu chạy với vận tốc 30km/h và giữa đường nghỉ một giờthif cũng muộn mất 2 giờ hỏi để đến lơi đúng giờ mà dọc đường ko nghỉ thì phải chạy mỗi giờ bao nhiêu kinomet
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