PSLE One copier took 100 minutes while another took 150 minutes to print the same number of leaflets. The faster copier printed 7 more leaflets per minute than the slower one.
- The slower copier completed the job at 3.11 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 3.11 p.m. = 12.41 p.m.
Time that the printing started for the slower copier = 12.41 p.m.
(b)
Extra leaflets that the faster copier printed in 100 min
= 100 x 7
= 700
Difference in the time needed to print the leaflets
= 150 - 100
= 50 min
Speed of the slower copier
= 700 ÷ 50
= 14
Number of leaflets printed by the slower copier
= 150 x 14
= 2100
Both copiers printed the same number of leaflets.
Number of leaflets printed by the 2 copiers
= 2 x 2100
= 4200
Answer(s): (a) 12.41 p.m.; (b) 4200