1) Find Absolute and Commercial Timm Km. 2) And also, explain the terms and 3) State how commerical tonn km is different from absolute tonn km.

Note : Answer all the questions.

A truck starts with a load of 10 tonnes of goods from station P. It unloads 4 tonnes at station and rest of the goods at station R. It reaches back directly to station after getting reloaded with 8 tonnes of goods at station R. The distances between P to Q. Q to R and then from R to P are 40 kms., 60 kms. and 80 kms, respectively. Compute Absolute tonne km'. and Commercial tonne-km