If Karen can read 10 pages and complete 15 math problems in 30 minutes, then she can read 30 pages and complete 45 math problems in (30/10) * 30 = <<(30/10) * 30=90>>90 minutes.
Therefore, it will take Karen 90 minutes to do her homework. Answer: \boxed{90}.
Karen can read 10 pages and complete 15 math problems in 30 minutes. How long will it take her to do her homework if she has 30 pages to read and 45 math problems to complete
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