Working together, printer A and printer B would finish the task in 24 minutes. Printer A alone would finish the task in 60 minutes. How many pages does the task contain if printer B prints 7 pages a minute more than printer A ?	Pick one
A) 600  B) 840  C) 1000  D) 1200  E) 1500
Answer: 840.
<result>B</result>
Working together, printer A and printer B would finish the task in 24 minutes. Printer A alone would finish the task in 60 minutes. How many pages does the task contain if printer B prints 7 pages a minute more than printer A ?