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Let us assume the distance on the first trip is d The total distance = 4d The speed on first trip = 120 km/h The speed on second trip = 60 km/h The speed on the third trip = 30 km/h The speed on the fourth trip = 15 km/h The total time is taken by Ram in the whole trip = [(d/120) + (d/60) + (d/30) + (d/15) + (15d/120)] = (d/8) The average speed = (4d/d)/(d/8) = 32 km/hr
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