hai nguoi tho lam chung mot cong viec . Neu nguoi thu nhat lam mot minh thi 16 gio moi xong . neu nguoi thu hai lam mot minh thi 24 gio moi xong . dau tien nguoi thu nhat lam mot thoi gian roi giao cho nguoi thu hai lam not cho con lai . tong so thoi gian hai nguoi lam la 19 gio . hoi moi nguoi da lam may thoi gian