Let the distance between A and B be D km. Time taken to travel from A to B = D / 60 hours. Time taken to travel from B to A = D / 40 hours. Average speed = 2 × (Speed1 × Speed2) / (Speed1 + Speed2) = 2 × (60 × 40) / (60 + 40) = 4800 / 100 = 48 km/h. Correct option: a
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