It takes a Xerox ColorQube 857dn laser printer 9 minutes longer to complete a 1440-page print job

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It takes a Xerox ColorQube 857dn laser printer 9 minutes longer to complete a 1440-page print job by itself than it takes a Brother HL-L8350CDW to complete the same job by itself. Together the two printers can complete the job in 20 minutes. How long does it take each printer to complete the print job alone? What is the speed of each printer?

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