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Question

A printing machine ‘P’ and a printing machine ‘Q’ can print a set of documents in 14 hours and 21 hours, respectively. If both machines work together, then how much time do they need to print 80% of the documents?

A 5.4 hrs

B 10.5 hrs

C 6.7 hrs

D 12.4 hrs

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SSC CGL

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