IBPS PO Prelims 30 Sept 2023 Shift 2 Paper

Pipe A and B can fill the tank in 9 hours and 15 hours respectively and pipe C can empty the tank in 25 hours. If pipe A , B and C are opened simultaneously, pipe A was closed after four hours , pipe B was closed one hour before pipe A was closed and pipe C was closed after 10 hours. Then, Find what part of tank is filled ?