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1. 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 ?





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  • By: guest on 01 Jun 2017 05.49 pm
    (P + Q + R)'s 1 hour's work = 1 + 1 + 1 = 37 . 8 10 12 120 Work done by P, Q and R in 2 hours = 37 x 2 = 37 . 120 60 Remaining work = 1 - 37 = 23 . 60 60 (Q + R)'s 1 hour's work = 1 + 1 = 11 . 10 12 60 Now, 11 work is done by Q and R in 1 hour. 60 So, 23 work will be done by Q and R in 60 x 23 = 23 hours 2 hours. 60 11 60 11 So, the work will be finished approximately 2 hours after 11 A.M., i.e., around 1 P.M.
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