Question
When both printers N and P are used, a collection of books can be printed in 4 hours. While printing, Printer N broke down. As a result, it took 3 hours to complete printing. If it would take Printer P 12 hours to print the collection alone,
  1. How long would it take to print the collection of books using only Printer N? Express your answer in hours.
  2. How long was Printer N used before it broke down? Express your answer in hours.
4 m
(a)

Click button first when a symbol is required. X

(b)

Click button first when a symbol is required. X

When both printers N and P are used, a collection of books can be printed in 4 hours. While printing, Printer N broke down. As a result, it took 3 hours to complete printing. If it would take Printer P 12 hours to print the collection alone,
  1. How long would it take to print the collection of books using only Printer N? Express your answer in hours.
  2. How long was Printer N used before it broke down? Express your answer in hours.