6.Tại hai điểm A và B cách nhau 150km. Hai ôtô khởi hành đồng thời chuyển động cùng chiều nhau và đi từ A đến B. Xe đi ở A có vận tốc là v 1 = 60km/h, xe đi ở B có vận tốc v 2 = 40km/h. a/ Hỏi sau bao lâu kể từ lúc xuất phát thì hai xe gặp nhau. b/ Nếu lúc đầu 2 xe khởi hành cùng lúc thì sau 45ph khoảng cách giữa 2 xe là bao nhiêu

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