Giup1 mình bài thi thử tuyển sinh này nha lát mik hỏi típ Hai người đi xe đạp từ A đến B với vận tốc trung bình bằng nhau. Khi đi được 2/ quãng đường thì xe 1 bị hỏng nên phải dừng lại, xe đạp 2 vẫn đi típ, xe đạp 1 dừng lại 20 phút đợi xe hơi tới đón. Khi xe đạp 2 tới B thì xe hơi đã chở người đi xe đạp 1 về A trước đó 40 phút. Tính vận tốc xe đạp Mình ghi giống đề thi nhá chứ không sai đề làm nhanh giúp

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