A cistern is normally filled with eater in 10 hours but takes 5 hours longer to fill because of a leak in its bottom . If the cistern is full, the leak will empty the cistern in -
A. 20 hours
B. 30 hours
C. 40 hours
D. 50 hours.
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সঠিক উত্তরঃ
B.
30 hours
Explanation:
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