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Q.
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.
20 hrs
B.
28 hrs
C.
36 hrs
D.
40 hrs
View Answer
Correct choice: A
Explanation:
1/8 - 1/x = 1/10 => x = 40 hrs
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