Answer:
In common law, the bailee has the obligation to return the goods to the bailor once there contract or agreement is over. The goods must be returned in the same condition as they were before. If the bailee fails to return the goods or returns them in a different condition, e.g. broken, damaged, or changed, he/she is liable to the bailor.
Sudarshan is the bailor since he entrusted petrol (gasoline?) and Raghman is the bailee since he received the goods. Raghman has the obligation to return he goods in the same condition as he received them. Arguing that he is not liable simply because he cannot return the goods is no excuse.