40 men working 8 hours per day can complete a piece of work in 21 days. How many hours per day must 120 men work to complete the same piece of work in 7 days?

40 men working 8 hours per day can complete a piece of work in 21 days

1.	40 men working 8 hours per day can complete a piece of work in 21 days. How many hours per day must 120 men work to complete the same piece of work in 7 days?
A.	9 hrs
B.	10 hrs
C.	12 hrs
D.	8 hrs
Answer» E.

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40 men working 8 hours per day can complete a piece of work in 21 days. How many hours per day must 120 men work to complete the same piece of work in 7 days?

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