Time for the first part = Distance / Speed = 30 / 15 = 2 hours. Time for the second part = 20 / 10 = 2 hours. Time for the third part = 50 / 25 = 2 hours. Total distance = 30 + 20 + 50 = 100 km. Total time = 2 + 2 + 2 = 6 hours. Average speed = Total distance / Total time = 100 / 6 ≈ 16.67 km/h. Correct Option: b
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