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     EduGorilla 
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    A number of men undertook to dig a ditch and could have finished the job in 7 hours, if they had begun working simultaneously, but they began one after another, the intervals between their starting times being equal. After the last worker had begun working, a time interval of the same length elapsed and the job was finished, each one of the participants working till the completion of the job. How long did they work, if the work of the first worker to begin was 6 times as long as the last one to begin?

    Options :-

    1. 10 hours
    2. 11 hours
    3. 111/hours
    4. 12 hours
    5. 14 hours
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