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A can complete a work in 12 days, B in 1...

A can complete a work in 12 days, B in 15 days. Find the time taken by them: when A and B worked together, when A and B worked alternatively and worked started by A

A

`9 3/4` days

B

`13 1/4 days`

C

`12 days`

D

`13 days`

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