City A and city B are expensive cities for business travel. On the basis of the average total costs per day for each city (which include a hotel room, car rental, and three meals), 3 days in city A and 4 days in city B cost $5560, while 6 days in city A and 3 days in city B cost $7875. What was the average cost per day in each city? What is the average cost per day in city A? (Simplify your answer.) What is the average cost per day in city B? (Simplify your answer.)