Réponse :
Voilà :)
Explications :
1. What is Kate going to do tomorrow ?
--> She is going to hang out with her cousins.
2. Where are they going to meet ?
--> They are going to meet at the shopping centre.
3. How long are they going to stay there ?
--> They are going to stay for three hours.
4. Where are they going to have lunch ?
--> They are going to have lunch at the Italian restaurant.
5. When are they going home ?
--> They are going home in the afternoon.