giúp mình với, mình cần gắp!! Nhà từ nhà đến trường khoảng 500m. Nhưng lúc về do ngược chiều phải đi 550m. Biết vận tốc xe là 30km/h. Hỏi mất bao nhiêu thời gian đi từ nhà đến trường và quay về?.

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