PSLE One copier took 100 minutes while another took 120 minutes to print the same number of leaflets. The faster copier printed 9 more leaflets per minute than the slower one.
- The slower copier completed the job at 2.39 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 2.39 p.m. = 12.39 p.m.
Time that the printing started for the slower copier = 12.39 p.m.
(b)
Extra leaflets that the faster copier printed in 100 min
= 100 x 9
= 900
Difference in the time needed to print the leaflets
= 120 - 100
= 20 min
Speed of the slower copier
= 900 ÷ 20
= 45
Number of leaflets printed by the slower copier
= 120 x 45
= 5400
Both copiers printed the same number of leaflets.
Number of leaflets printed by the 2 copiers
= 2 x 5400
= 10800
Answer(s): (a) 12.39 p.m.; (b) 10800