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Multiple Choice Questions

James can lay railway track between two given stations in 40 days and Johnny can do the same job in ...........

Quantitative Aptitude (HP Allied) Time and work

James can lay railway track between two given stations in 40 days and Johnny can do the same job in 20 days. With help of Paul, they did the job in 5 days only. Then, Paul alone can do the job in ?

6 days

7 days

8 days

9 days

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Explanation:

Jame's 1 day's work = 1/40 ,
Johnny's 1 day's work = 1/20 .
Therefore Paul's 1 day's work = 1/5 - ( 1/40 + 1/20 ) =1/5- (3/40) =5/40
So, Paul alone can do the work in 40/5 = 8 days.

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