Haunted Mansion- haunted mansion i went on with my mom..so only two people, but we could have easily fit a third person.
Peter Pan- again, i only went on with one other person...but im not sure if u could go on with three.
Test Track- in test track there are three people in the front seat of the car, and three in the back seat.
Spaceship Earth- sorry i cant remember!
hope i helped!