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Hai người đi xe đạp cùng chd thẳng đều từ a đến b .Ng 1 xuất phát lúc 6h vs vận tốc v1 =6km/h. Ng 2 xuất phát lúc 6h30' vs vạn tốc v2 =12km/h .A) xác định khoảng cách giữa hai người đó lúc 7h30'.B) 1 ng thứ ba cũng đi xe đạp từ a đến b vs vận tốc ko đổi v3 nhưng xuất phát lúc 7h .Khoảng thời gian giữa hai lần gặp nhau của ng thứ ba vs ng thứ nhất và ng thứ hai là ∆t=54' .Xác định vận tốc v3 của ng thứ ba
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Hai người đi xe đạp cùng chd thẳng đều từ a đến b .Ng 1 xuất phát lúc 6h vs vận tốc v1 =6km/h. Ng 2...
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