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A cistern is normally filled in 8 hours but takes two hours longer to fill because of a leak in its bottom. If the cistern is full, the leak will empty it in?

/ Mathematics Mcqs, Pipes and Cisterns / By
A cistern is normally filled in 8 hours but takes two hours longer to fill because of a leak in its bottom. If the cistern is full, the leak will empty it in?

A. 16 hrs
B. 20 hrs
C. 40 hrs
D. 25 hrs
Explanation:
1/8 – 1/x = 1/10
x = 40