a, Sau một giờ, cả 2 ô tô đi được :  

                 180 : 2 = 90 (km)

b, Vận tốc của  ô tô đó xuất phát từ A là:

                  90 : (2 + 3) x 2 = 36 (km/giờ)

Vận tốc của ô tô xuất phát từ B là:

                  90 - 36 = 54 (km/giờ)

                       Đáp số: a, 90 km

                                b, Ô tô đi từ A: 36 km/giờ

                                   Ô tô đi từ B: 54 km/giờ 

11

My favorite pet is a dog. I love dogs because they are cute and loyal to their owners. I have a dog at home, his name is Ki. Ki is a dog which I have been keeping for four years. It is a Poodle so it is really friendly. It has bushy and soft brown fur and glistening eyes. When I look at his big, beautiful eyes, I just melt like ice cream on a hot summer day. Ki takes pleasure in sniffing everything when he has nothing particular to do. Everyday, I give her some biscuits and milk in the morning, rice and meat in the afternoon. Whenever I go out in the evening, he always accompanies me like he wants to protect me. Ki seems to be one of my best friends, I love him very much!