Printer a can print 30 pages per minute. printer b can print 40 pages per minute. printer b begins printing 3 minutes after printer a begins printing. both printers stop printing 10 minutes after printer a started. together, how many pages did the two printers print?

Printer A prints for 10 minutes, so prints

... (30 pages/minute)×(10 minutes) = 300 pages

Printer B prints for 7 minutes, so prints

... (40 pages/minute)×(7 minutes) = 280 pages

At the end of 10 minutes, the two printers will have printed

... 300 pages + 280 pages = 580 pages