một người đi xe máy từ A đến B với thời gian và vận tốc đã dự định.Nếu người đó đi nhanh hơn dự định trong mỗi giờ là 10 km thì đến đích sớm hơn dự định là 36 phút.Nếu ngươiù đó đi chậm hơn dự địnhtrong mỗi giờ là 10 km thì đến đích muộn hơn dụ định là 1 giờ.Tính vận tốc dự định của người đó và chiều dài quãng đường AB

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