AlgebraHardTwo printers, staggered start
Algebra practice question
Printer A prints 40 pages per minute and printer B prints 55 pages per minute. Printer A runs alone for 4 minutes, and then both printers run together until the job's 635 pages are done. For how many minutes do the two printers run together?
Answer: 5
A alone produces 160 pages. The remaining 475 pages print at 95 pages per minute: 475 ÷ 95 = 5 minutes.
Common wrong answers
- If you answered 7
- Only the time together is asked; the first 4 minutes are A alone, then 5 more together.
- If you answered 9
- 9 is the total minutes from the start; the printers run together for 5 of them.
- If you answered 475
- 475 is the pages left after A's solo run; divide by the combined 95 pages/min.
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