Cars produce carbon dioxide pollution. The rate they produce the pollution is measured in g/km (grams per kilometer). Suppose that a family's two cars produce a combined rate of 45 g/km of carbon dioxide pollution. During one day last week, the first car drove 30 kilometers and the second drove 35 kilometers. The two cars produced a combined total of 1450 grams of carbon dioxide pollution. At what rate does each car produce carbon dioxide pollution?
A) 1 g/km, 2 g/km
B) 2 g/km, 1 g/km
C) 3 g/km, 4 g/km
D) 4 g/km, 3 g/km