Aptitude - Time and work - Discussion

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Q.

A can do a piece of work in 80 days. He works at it for 10 days B alone finishes the remaining work in 42 days. In how much time will A and B working together, finish the work?                         
A. 30 B. 15
C. 20 D. 25

Answer: Option A
Explaination:

 


No Explanation




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