Since the train covers different distance with different speeds. So, Average speed = Total Distance/Total Time Total distance = 77 + 63 + 24 = 164 km Time1 = 77/35, Time2 = 63/42 & Time3 = 24/80 Total Time = 77/35 + 63/42 + 24/80 Therefore, Average Speed = 164/(77/35 + 63/42 + 24/80) = 41 km/hr
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