Aptitude - Time and work - Discussion

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Q.

A machine P can print one lakh books in 8 hours, machine Q can print the same number of books in 10 hours while machine R can print them in 12 hours. All the machines are started at 9 A.M. while machine P is closed at 11 A.M. and the remaining two machines complete work. Approximately at what time will the work (to print one lakh books) be finished ?                         
A. 11:30 A.M. B. 12 noon
C. 12:30 P.M. D. 1:00 P.M.

Answer: Option D
Explaination:

 


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