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Bài 1 : Một máy bay , bay từ a đến b với tốc 850 km / giờ . Máy bay xuất phát từ A lúc 10 giờ 20 phút và tới B lúc 12 giờ 45 phút . Hãy tính quãng đường máy bay , bay từ A đến b Bài 2 : Anh Chính đi xe máy khởi hành từ nhà lúc 8 giờ . Đến hiệu sách anh dừng lại 30 phút ở hiệu sách để mua sách rồi về nhà luôn . Biết rằng quãng đường từ nhà đến hiệu sách là 8,75 km và vận tốc đi xe mày là 35km/giờ . Hỏi anh Chính về tới nhà lúc mấy giờ ?
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