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Three friends Anne, Bob and Chris work...

Three friends Anne, Bob and Chris work together to do a certain hob. The time it takes them to do the work together is 6 hours less than Anne would have take alone, 1 hour less than Bob would have taken alone and half the time Chris taken working alone. How long did it take them to complete the job, working together? `20\ min` b. `30\ min` c. `40\ min` d. `50\ min`

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