P can complete a work in 12 days working...

P can complete a work in 12 days working 8 hours a day. Q can complete the same work in 8 days working 10 hours a day. If both P and Q work together, working 8 hours a day, in how many days can they complete the work ? `5 5/(11)` b. `5 6/(11)` c. `6 6/(11)` d. `6 6/(11)`

`5(5)/(11)`

`5(6)/(11)`

`6(5)/(11)`

`6(6)/(11)`

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