Anwar can fill a pool with buckets of water in 30 minutes, Bobby can do the same job in 45 minutes, and Dipu can do the same job in 1½ hours. How quickly can all three fill the pool together (in minutes)?
A. 9
B. 12
C. 15
D. 21
E. none of these
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সঠিক উত্তরঃ
C.
15
Explanation:
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