Answer Posted / sumit sourabh

‎40 men work 6 hours 45 minutes a day for 20 days to complete the job...........

AS WE SEE
(30*20*9)=(40*20*H)
5400=800 * H
H = 6.75 HOURS
I.E; 6 HOURS 45 MINUTES IS THE WORK DONE PER DAY

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