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

Working $5$ hours a day, A can complete a work in $8$ days and working $6$ hours a day, B can complete the same work in $10$ days. Working $8$ hours a day, they can jointly complete the work in:

  1. A.$3$ daysCorrect answer
  2. B.$4$ days
  3. C.$5$ days
  4. D.$6$ days

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Quick fact: Working $8$ hours a day, A and B together can complete the work in $3$ days.

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