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Q 2431067822.     A and B can complete work together in `5` days. If A
works at twice his speed and B at half of his speed,
this work can be finished in `4` days. How many days
would it take for A alone to complete the job?
IAS 2007 Prelims
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)