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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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Answer Posted / sneha aitha
30 men-20 days-9 hours
40 men- ? - ?
so m1 d1 h1 = m2 d2 h2
30*20*9 = 40*d2*h2
m1d1=m2d2
30*20=40*d2 then d2=15
30*20*9=40*15*x
so then x=9hrs
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