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Mathematics 24 Online
OpenStudy (anonymous):

Which set of equations would be used to solve this word problem? An airplane flew 3.5 hours with a 40 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 = 6(r + 40) d = 3.5(r + 40) and d = 2.5(r - 40) d = 3.5(r - 40) and d = 2.5(r + 40) None of these systems can be used to solve this problem.

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