Printer P can print one lakh books in 8 hours. Printer Q can print the same number of books in 10 hours while Printer R can print the same in 12 hours. All the Printers started printing at 9 A.M. Printer P is stopped at 11 A.M. and the remaining 2printers complete work. Approximately at what time will the printing of 1 lac books be completed?	Choose the most appropriate option:
A) 12 pm  B) 1 pm  C) 2 pm  D) 3 pm  E) 4 pm
Work done by P in 1 hour = 1/8   Work done by Q in 1 hour = 1/10   Work done by R in 1 hour = 1/12   Work done by P,Q and R in 1 hour = 1/8 + 1/10 + 1/12 = 37/120   Work done by Q and R in 1 hour = 1/10 + 1/12 = 22/120 = 11/60   From 9 am to 11 am, all the Printer were operating.   Ie, they all operated for 2 hours and work completed = 2 × (37/120) = 37/60   Pending work = 1- 37/60 = 23/60   Hours taken by Q an R to complete the pending work = (23/60) / (11/60) = 23/11   which is approximately equal to 2   Hence the work will be completed approximately 2 hours after 11 am ; ie around 1 pm   1 pm
<result>B</result>
Printer P can print one lakh books in 8 hours. Printer Q can print the same number of books in 10 hours while Printer R can print the same in 12 hours. All the Printers started printing at 9 A.M. Printer P is stopped at 11 A.M. and the remaining 2printers complete work. Approximately at what time will the printing of 1 lac books be completed?