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OpenStudy (anonymous):
Which set of equations would be used to solve this word problem? An airplane flew 5 hours with a 50 mph head wind. The return trip with a tail wind of the same speed took 3 hours. Find the speed of the plane in still air. A.d = 8(r + 50) B.d = 5(r + 50) and d = 3(r − 50) C.d = 5(r − 50) and d = 3(r + 50) D.None of these systems can be used to solve this problem.
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