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A and B working separately can do a piece of work in 9 and 15 days respectively. If they work for a day alternatively, with A beginning, then the work will be completed in 

(a) 10 days 

(b) 11 days 

(c) 9 days 

(d) 12 days

1 Answer

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Correct option (b) 11 days


Now A’s turn. And he will complete in = 5/5 = 1 days

Then total work completed in = 10 + 1 = 11days

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