How many movies have Keshav Naidu and Manmohan Singh collaborated on?

They have worked on 4 movies together! Their first movie together was Lamhe (1991) while their highest rated movie together was Dilwale Dulhania Le Jayenge (1995). They have not worked together since Jab Pyaar Kisise Hota Hai (1998). They are most known for their drama films together.