Working together without a break, Jermaine and Crystal can do a job in 12 hours. How long will it take Crystal to do...

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A

B

C

D

E

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Source: Princeton Review

Working together without a break, Jermaine and Crystal can do a job in 12 hours. How long will it take Crystal to do the job alone?

1) Working without a break, Jermaine takes 16 hours to do the job alone
2) Working alone and without a break, Crystal take 24 hours to do half the job

The OA is D
Source: — Data Sufficiency |