A can do 3 piece of work in 4 hours, B and C together in 3 hours , and A and C together in 2 hours. How long will B alone take to do it?
A. 8 hours
B. 12 hours
C. s10hours
D. 24 hours
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সঠিক উত্তরঃ
B.
12 hours
Explanation:
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