PSLE
Mr Koh used two printers with different printing rates for a printing job. He started Printer L at 15 50 and started Printer M one minute later. He stopped both copiers at 15 55. 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 L at the time Mr Koh started Printer M?
2. What was the difference in the number of pages printed by the two copiers from 15 50 to 15 55?
3. Which printer, L or M, has a slower 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 15 51, number of pages that Printer L printed = 16

(b)
Number of pages printed by Printer L from 15 50 to 15 55
= 80

Number of pages printed by Printer M from 15 50 to 15 55
= 180

Difference in the number of pages printed by the two copiers from 15 50 to 15 55
= 180 - 80
= 100

(c)
Printing rate of Printer L
= 80 ÷ 5
= 16 (Slower)

Printing rate of Printer M
= 180 ÷ 4
= 45 (Faster)

Difference in the number of pages printed by the copiers in one minute
= 45 - 16
= 29

Answer(s): (a) 16; (b) 100; (c) L, 29