X and Z start a piece of work and after 10 days Z left the work. 2 days after Z left the work Y joined X and finished the whole work in 'T' days. Each person did equal share of the work. If X and Z worked together, the work would have ended in 'T' days. Find in how many days Y alone can complete the work?
A) 15 days
B) 20 days
C) 24 days
D) 30 days
E) None of these
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23 days
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