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caythongbuon2001
2 năm trước
Quãng đường AB dài 30km. Một người đi xe đạp dự định đi từ A đến B trong thời giannhất định. Do đường khó đi nên người đi xe đạp đã đi với vận tốc bé hơn vận tốc dự định 5km/hvà đã đến B muộn hơn dự định 1 giờ. Tìm vận tốc dự định?
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