PSLE One copier took 100 minutes while another took 150 minutes to print the same number of leaflets. The faster copier printed 12 more leaflets per minute than the slower one.
- The slower copier completed the job at 3.16 p.m. At what time was the printing started?
- What was the total number of leaflets printed by the two copiers?
(a)
150 min before 3.16 p.m. = 12.46 p.m.
Time that the printing started for the slower copier = 12.46 p.m.
(b)
Extra leaflets that the faster copier printed in 100 min
= 100 x 12
= 1200
Difference in the time needed to print the leaflets
= 150 - 100
= 50 min
Speed of the slower copier
= 1200 ÷ 50
= 24
Number of leaflets printed by the slower copier
= 150 x 24
= 3600
Both copiers printed the same number of leaflets.
Number of leaflets printed by the 2 copiers
= 2 x 3600
= 7200
Answer(s): (a) 12.46 p.m.; (b) 7200