A number of men undertook to dig a ditch and could have finished the job in 14 hours, if they had all begun working simultaneously. But only one of them starts working. A 2nd person starts working after x hours. 3rd person starts working x hours after 2nd person starts working. Similarly each successive person starts working x hours after the previous worker starts. After the last worker had begun working the job was finished in x hours, each one of the participants working till the completion of the job. How long did they work, if the first worker to begin worked 6 times as long as the last one to begin?
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