Let the distance between the two cities be D km. Time taken to travel from A to B = D / 60 Time taken to travel from B to A = D / 40 Total time = D/60 + D/40 = 6 hours Finding a common denominator: (2D + 3D) / 120 = 6 5D = 720 D = 720 / 5 = 144 km Correct answer: c
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