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hoangthuha0909
2 năm trước
ban an va binh o cung 1 vi tri cach tp hcm 150 km , cung tren 1 doan duong ve tphcm , an di voi van toc 30km/h , binh di di voi van toc 45km/h . Goi d ( km ) la khoang cach tu tp hcm den vi tri An , binh sau khi di t ( gio ) A) lap ham so d theo t doi oi moi nguoi B) Hoineu 2 nguoi xuat phatcung 1luc thi vao thoi diem nao ke tu luc xuat phat , khoang cach 2 nguoi la 30 km
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