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A machine P can print out 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 stopped at 11 A.M. and remaining two machines completed the work. Approximately at what at what time will the work time (to print one lakh books) be finished?

Correct Answer: 11.30 Am
Machine P in 1 hour can print 1/8 of te books Machine Q in 1 hour can print 1/10 of te books Machine R in 1 hour can print 1/12 of te books Together in 1 hour they can print = 1/8 + 1/10 + 1/12 = (15 + 12 + 10)/120 = 37/120 of the books They worked altogether from 9am to 11am = 2 hours So, together they printed = 37/120×2 = 37/60 of the books Remaining books to be printed = 1 - 37/60 = 23/60 of the books Now, machine Q and R together can print (1/10 + 1/12 = ) 11/60 of the books in 1 hour So, they can print 23/60 of the books in 1×(23/60)×(60/11) = 2.09 hours = 125 min So, printing will be finished at 9am + 125min = 11:05am approximately.

A machine P can paint 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 started operating at 9 A. M. while machine P is stopped at 11 A. M. and the reamaining two machines completed the work. Approximately at what time will the work (to print one lakh books) be finished?

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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In the following passage some of the words have been left out. Read the passage carefully and select the correct answer for the given blank out of the four alternatives. Books are our ______ friends. They are our guides. We can learn everything from them. The books contain all the great ______ of the world's leaders and we can learn them by reading the books. The books help us find ______ to our questions. The books never fail us. We should read as ______ books as we can. But all books are not good. So we should ______ only good books. the great ______ of our world.

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