Thirty men take 20 days to complete a job working 9 hours a day. How many hour

Thirty men take 20 days to complete a job working 9 hours a
day. How many hour a day should 40 men work to complete the job?

(a) 8 hrs
(b) 7 1/2 hrs
(c) 7 hrs
(d) 9 hrs

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