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lunhathailam2003
2 năm trước
Quãng đường AB dài 30km .Một người đi xe đạp dự định đi từ A đến B trong thời gian nhất định .Do đường khó đi nên người đi xe đạp đã đi với vận tốc bé hơn dự định 5km/h và đã đến B muộn hơn dự định 1 giờ. Tìm vận tốc dự định ? GIÚP MIK VỚI NHANH NHÉ!
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