In this question, some equations are solved on the basis of a certain system. On the same basis find out the correct answer from amongst the four alternatives for the unsolved equation.
In the following question, which one set of letters when sequentially placed at the gaps in the given letter series shall complete it? l m _ o _ n m _ l _ n _ _ n m l
A man is facing towards the east. He turns towards north and walks for 5 km, and then turns 270 degrees anticlockwise and walks for 12 km more. What is the minimum distance between his initial and final position?