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A can do a piece of work in 30 days. He works at it for 6 days and then B finishes it in 18 days. In what time can A and B together it ?

Correct Answer: 12 6/7 days

Explanation:

Let 'B' alone can do the work in 'x' days


6/30 + 18/x = 1


=> x = 22.5


 


1/30 + 1/22.5 = 7/90 


=> 90/7 = 12 6/7 days


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