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A, B and C can complete a work in 2h. I...

A, B and C can complete a work in 2h. If A does the job alone in 6h and B in 5h, how long will it take for C to finish the job alone ?

A

`5frac(1)(2)` h

B

`7frac(1)(2)` h

C

9 h

D

`4frac(1)(2)`h

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