Arithmetic Aptitude Time and Work

• A 10 hrs
• B 12 hrs
• C 15 hrs
• D 9 hrs
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B

Answer: B

If the work rate of A is 1/4 of the task per hour, the work rate of B and C together is 1/3 of the task per hour,
and the work rate of A and C together is 1/2 of the task per hour,
then the work rate of B alone is (1/3 - 1/4) of the task per hour.
Therefore, B will take 12 hours to complete the task on their own.

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