PSLE One copier took 90 minutes while another took 120 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 2.38 p.m. At what time was the printing started?
- What was the total number of leaflets printed by the two copiers?
(a)
120 min before 2.38 p.m. = 12.38 p.m.
Time that the printing started for the slower copier = 12.38 p.m.
(b)
Extra leaflets that the faster copier printed in 90 min
= 90 x 3
= 270
Difference in the time needed to print the leaflets
= 120 - 90
= 30 min
Speed of the slower copier
= 270 ÷ 30
= 9
Number of leaflets printed by the slower copier
= 120 x 9
= 1080
Both copiers printed the same number of leaflets.
Number of leaflets printed by the 2 copiers
= 2 x 1080
= 2160
Answer(s): (a) 12.38 p.m.; (b) 2160