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hunghihi
2 năm trước
Nhà Lan và Điệp cùng nằm trên một con đường. Lúc 6 giờ, điệp bắt đầu đi đến trường với vận tốc 9,6 km/giờ, cùng lúc đó Lan đi với vận tốc 5km/giờ. Đến 6 giờ 30 thì 2 bạn gặp nhau. Hỏi nhà 2 bạn cách nhau bao xa
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