quãng đường ab dài 120km lúc 6h15p sáng một oto khách đi từ a đến b với v = 50km/giờ nghỉ t với b về a trả khách hết 45 phút .sau đó lại đi từ b về a với v= 60km/giờ.hỏi ôt về đến a lúc mấy h

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