Q: We are 10 people group, and we are going to Port Olimpic from BCN airport El Prat. Your website shows we have to take train (R2 Nord Train from BCN airport) to Passeig de Gràcia train station and there take L4 metro (yellow line) as we have to get off on Vila Olimpica. We will be returning to BCN airport in the same way after 8 days. What kind of tickets (T10 x 2 or a group ticket ?) should we buy in order to be able to use rails and metro on the same ticket and get the best price?
A: You will just need 2 x T10 tickets which will cover you for the entire return journey (both train and metro). The T10 will give 10 people a one way trip to Vila Olimpica. The second T10 will cover you for the return journey. The T10 is valid until the end of January of the following year, so you have no problems with 8 days. You can take both the airport train and metro provided the total journey time is less than 1 hour and 15 minutes which it should be for this journey. All you have to do is put the T10 ticket through the ticket validation machine at the entrance to the train station at Barcelona airport and then the same again when you want to use the metro at Passeig de Gràcia station. You can then pass it to the next person in your group that will do the same. The T10 is a multi-person ticket.
The same guidance would be true if you wanted to take your group to any stop on the Barcelona metro not just Villa Olimpic from the airport.