X cm complete a certain work in same time in which Y and Z together can do it. If X and Y together can finish it in 10 days and Z alone in 15 days, then Y alone can do it in ?
A. 22 days
B. 60 days
C. 20 days
D. 25 days
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সঠিক উত্তরঃ
B.
60 days
Explanation:
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