In a press, there are three types of printing machines, P, Q and R. Machine P can print 10,000 pages in 8 hours, machine Q can finish the same task in 10 hours and machine R. can finish the same task in 15 hours. All the three machines start the work at 9:00 a.m. Machine P breaks down at 11:00 a.m. and machines Q and R finish the task. The approximate time of completion of the job is:
Show answer & explanation
Correct answer: D
Explanation
The correct answer is Option 4 i.e. 1:30 p.m.
P, Q, R work 2 hrs → 5833 pages done
Left = 4167 pages
Q + R rate = 1667 pages/hr
Time = 4167 ÷ 1667 ≈ 2.5 hrs
Total time = 2 + 2.5 = 4.5 hrs → 1:30 p.m.