PSLE
Mr Toh used two printers with different printing rates for a printing job. He started Printer Z at 13 01 and started Printer A three minutes later. He stopped both copiers at 13 06. The graphs show the total number of pages printed by each printer from the start of printing.

1. How many pages had been printed by Printer Z at the time Mr Toh started Printer A?
2. What was the difference in the number of pages printed by the two copiers from 13 01 to 13 06?
3. Which printer, Z or A, has a faster printing rate? What is the difference in the number of pages printed by the copiers in one minute? Give your answer in this format. (Eg A, 1)

(a)
At 13 04, number of pages that Printer Z printed = 270

(b)
Number of pages printed by Printer Z from 13 01 to 13 06
= 450

Number of pages printed by Printer A from 13 01 to 13 06
= 200

Difference in the number of pages printed by the two copiers from 13 01 to 13 06
= 450 - 200
= 250

(c)
Printing rate of Printer Z
= 450 ÷ 5
= 90

Printing rate of Printer A
= 200 ÷ 2
= 100 (Faster)

Difference in the number of pages printed by the copiers in one minute
= 100 - 90
= 10

Answer(s): (a) 270; (b) 250; (c) A, 10