Mathematics, 25.07.2021 20:30, queengenni

Luc 6 gio 1 o to xuat phat tu A den B voi van toc trung binh 40km/h. Khi den B, nguoi lai xe lam nhiem vu giao nhan hang trong 30 phut roi cho xe quay tro ve A voi van to trung binh 30km/h. Tinh quang duong AB, biet rang o to ve A luc 10 gio cung ngay

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Luc 6 gio 1 o to xuat phat tu A den B voi van toc trung binh 40km/h. Khi den B, nguoi lai xe lam nhi...