16 A lorry starts with a load of 20 tons of goods from Station A. It unloads 8 tons at Station B and the rest of goods at Station C. It reaches back directly to Station A after getting reloaded with 16 tons of goods at Station C. The distance between A to B, B to C and then from C to A are 80 km., 120 km., and 160 km. respectively. Compute absolute ton-kilometres and commercial ton-kilometres