rajeev takes one hour to arrange 96 books. sanjeev takes one and a half hour to arrange the same number of books. working together, how many hours will they take to arrange 4000 books?

It looks like you started a query about "Rajeev takes one hour to arrange 9..." but didn't complete it. Could you please provide the full question or clarify what Rajeev is arranging? For example, is it arranging books, chairs, numbers, or something else? This will help me give you an accurate and helpful answer.