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Asked in PPSC, FPSC and other one-paper exams (compiled from unofficial resources).

Time, Work & Distance ProblemsWork and Time

If 10 persons can do a job in 20 days, then 20 persons with twice the efficiency can do the same job in how many days?

A.$5$ daysCorrect answer
B.$10$ days
C.$15$ days
D.$2.5$ days

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Quick fact: The job will be completed in $5$ days.

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