Multiple Choice Questions on Three printing press P Q and R can print 1 lack books in 5 hrs 15 hrs and 10 hrs respectively If all........... for SSC CGL Exam Preparation

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Multiple Choice Questions

Three printing press P Q and R can print 1 lack books in 5 hrs 15 hrs and 10 hrs respectively If all...........

Quantitative Aptitude (CGL) Time and work
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    Three printing press P, Q and R can print 1 lack books in 5 hrs, 15 hrs and 10 hrs respectively. If all the press starts at 10 am and press R is stopped after 2 hrs then at what time work will be complete. 

    12 pm

    Incorrect Answer

    1 pm

    Correct Answer

    2pm

    Incorrect Answer

    3pm

    Incorrect Answer
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    Explanation:

    Answer & Solution
    Answer – 1 pm
    Solution:
    Time taken by P = 5hrs, Q = 15hr and R = 10 hrs
    (1/5+1/15+1/10)*2 + (1/5 + 1/15)*X = 1 (X = time taken to do remaining work)
    after solving we get X = 1. So 2+1 = 3hrs. i.e at 1pm work will be completed.

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