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pham31182
2 năm trước
Lúc 7h, một chiếc ô tô đi với vận tốc 30km/h, gặp một người đi mô tô ngược chiều. Lúc 7h30 phút, ô tô đến điểm trả hàng. Sau khi trả hàng mất 1h, ô tô quay lại, đi với vận tốc 50km/h và gặp mô tô lúc 10h. Tính vận tốc của mô tô.
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