9. 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 9AM while machine P is closed at 11 AM and the remaining two machines complete work Approximately at what time will the work (to print one lakh books) be
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14 hours is the time taken by printer
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