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Two workers 'A' and 'B' working together...

Two workers 'A' and 'B' working together completed a job in 5 days. Had 'A' worked twice as efficiently as he actually did, the work would have completed in 3 days. In how many days could 'A' alone complete the job ?

A

`3(1)/(2)` days

B

`4(1)/(6)` days

C

`7(1)/(2)` days

D

`6(1)/(4)` days

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