Question
39 men can build a bridge in 12 days, working 5 hours a day. In how many days will 30 men, working 6 hours a day, complete the work?
Answer: Option B
:
B
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:
B
Let the required number of days with 30 men working for 6 hours be x.
Number of men3930Number of hours56Number of days12x
Number of men, number of hours and number of days are inversely proportional and work done is constant in both the cases, hence
⇒39×12×5=30× x ×6x=39×12×530×6x=13 days
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