PSLE One copier took 80 minutes while another took 90 minutes to print the same number of leaflets. The faster copier printed 3 more leaflets per minute than the slower one.
- The slower copier completed the job at 1.40 p.m. At what time was the printing started?
- What was the total number of leaflets printed by the two copiers?
(a)
90 min before 1.40 p.m. = 12.10 p.m.
Time that the printing started for the slower copier = 12.10 p.m.
(b)
Extra leaflets that the faster copier printed in 80 min
= 80 x 3
= 240
Difference in the time needed to print the leaflets
= 90 - 80
= 10 min
Speed of the slower copier
= 240 ÷ 10
= 24
Number of leaflets printed by the slower copier
= 90 x 24
= 2160
Both copiers printed the same number of leaflets.
Number of leaflets printed by the 2 copiers
= 2 x 2160
= 4320
Answer(s): (a) 12.10 p.m.; (b) 4320