If I travel for 60 km from home, and after I reach my destination I decide to travel another 30 km, will I then become a musaafir?

Answer

You will not be a musaafir if it was your intention to travel less than 77 km when you left home. Therefore, you will not be a musaafir after travelling 30 km from the 60 km destination. Even if you travel thousands of kilometres in this manner you will not be a musaafir. The condition is that the intention must be to travel 77 km or more from wherever your destination is. Since you did not have this intention (of 77 km) from the 60 km destination, you will not be a musaafir.