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caominhtri2709
2 năm trước
lúc 6h một người đi xe đạp xuất phat từ A về B với vận tốc v1=12km/h.Sau đó 2h một người đi bộ từ B đến A với vận tốc v2=4km/h.Biết AB=48km a)Hỏi 2 người gặp nhau lúc mấy giờ.Nơi gặp nhau cách A bao nhiêu km b)Nếu người đi xe đạp sau khi đi được 2 giờ rồi lại đi tiếp với vận tốc cũ thì hai người gặp nhau lúc mấy giờ.Nơi gặp nhau cách A bao nhiêu km
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