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Which set of equations would be used to solve this word problem? An airplane flew 4.5 hours with a 45 mph head wind. The return trip with a tail wind of the same speed took 2.5 hours. Find the speed of the plane in still air. Answer d = 7(r + 45) None of these systems can be used to solve this problem. d = 4.5(r + 45) and d = 2.5(r - 45) d = 4.5(r - 45) and d = 2.5(r + 45)