Since Jon and Sarah must travel in the same taxi, we consider them as a single unit. This leaves us with 6 other friends to arrange.

First, choose 2 more friends to join Jon and Sarah in the same taxi. This can be done in \\(^6C_2\\) ways.

The remaining 4 friends automatically go into the other taxi. Thus, the number of ways to choose the groups is \\(^6C_2\\).

However, Jon and Sarah can be in either taxi P or taxi Q, so we multiply by 2 to account for both possibilities.

Therefore, the total number of ways is \\(^6C_2 \\times 2 = 15 \\times 2 = 30\\).