A 16-year-old girl has died and her boyfriend has suffered serious injuries after the pair were hit by a car while arguing on a roadway. Georgia Galbraith and Ryan Whipp, both 16, were struck by a Toyota Corolla on the Old Hume Highway at about 10.20pm in Mittagong, NSW, on Friday. The fatal accident occurred after the Holden Commodore they were travelling in stopped in the second lane. Police sources told The Daily Telegraph the young couple were engaged in an argument with other passengers in their car. Georgia Galbraith, 16, (pictured) has died in hospital after she was hit by a car...