While travelling to Karachi, I ran __________ a very old friend of mine.
While travelling to Karachi, I ran __________ a very old friend of mine.
Explanation
Run into someone is a phrasal verb which means کسی سے غیر متوقع طور پر ملنا
Run into someone is a phrasal verb which means کسی سے غیر متوقع طور پر ملنا