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2014-07-28T16:14:20+05:30

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In 20 days 2000 meters work is done by 90 men.
So work capacity of 1 man =  2000 m  / (20 days * 90 men)  = 10/9 meter per day per man

Work remaining = 6 000 m - 2000 m = 4000 m
Days remaining = 35 days - 20 days = 15 days
One man can do in 15 days,  work = 10/9 * 15  = 50/3  meters
Number of men needed  = work remains / work capacity of one man
                         = 4000 / (50/3)  =    240  men needed
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