30 men take 20 days to finish a job working 9 hours per day. Find how many hours per day 40 men will take to finish the job?
If M1 persons can do W1 works in D1 days for T1 hours and M2 persons can do W2 works in D2 days for T2 hours then M1D1W1T1=M2D2W2T2 here W1= W2 = same work equation given: 30 x 9 = 40 x X X = 30 x 9 /40 270/40 6.75 6 hrs and 45 mins.
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