Time for the first 120 km = 120 / 60 = 2 hours. Time for the next 120 km = 120 / 80 = 1.5 hours. Total distance = 240 km. Total time = 2 + 1.5 = 3.5 hours. Average speed = Total distance / Total time = 240 / 3.5 = 68.57 km/h (approx). Correct answer: A) 68.5 km/h
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