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kimteahyung486
2 năm trước
Bài 4: Một xe máy đi từ A đuổi theo một người đi xe đạp khi hai người cách nhau 20 km. Sau 1 giờ 15 phút người đi xe máy đuổi kịp người đi xe đạp . a) Tính hiệu vận tốc của người đi xe máy và người đi xe đạp. b) Tính vận tốc của người đi xe máy , biết vận tốc của người đi xe máy gấp đôi vận tốc của người đi xe đạp.
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