A and B together can do a
piece of work in 12 days, while B alone can finish the work in 30 days. How long will A take to finish the work alone ?
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answer is 15 days
(A+B) jointly do a piece of work in... 12 days.
(A+B can do in 1 day.. 1/12 part of the work..(1)
B alone can do the same work in 60 days
B alone do the work in 1 day.... 1/60 part... (2)
Therefore A's daily part of work is…..
(1) - (2) = (1/12) - (1/60) = 4/60 or 1/15 part of the work, and hence A can do the same work in...
Whole work... 1/(1/15) = 15 days. is the answer.
(Thanks for asking a answer. I hope I am right!)
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