PSLE One copier took 70 minutes while another took 90 minutes to print the same number of leaflets. The faster copier printed 6 more leaflets per minute than the slower one.
- The slower copier completed the job at 1.43 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 1.43 p.m. = 12.13 p.m.
Time that the printing started for the slower copier = 12.13 p.m.
(b)
Extra leaflets that the faster copier printed in 70 min
= 70 x 6
= 420
Difference in the time needed to print the leaflets
= 90 - 70
= 20 min
Speed of the slower copier
= 420 ÷ 20
= 21
Number of leaflets printed by the slower copier
= 90 x 21
= 1890
Both copiers printed the same number of leaflets.
Number of leaflets printed by the 2 copiers
= 2 x 1890
= 3780
Answer(s): (a) 12.13 p.m.; (b) 3780