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Phanh24
2 năm trước
vào lúc 5 giờ sáng một người đạp xe từ Avề B với vận tốc 12km/giờ . Đến 8 giờ sáng thì một người khác đi xe đap từ B về A vận tốc 15 km/giờ . Biết quãng đường AB dài 117 km. Tìm thời gian gặp nhau và vị trí gặp nhau cách A bao xa
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