A cistern can be filled in 9 hours but it takes 10 hours due to a leak in its bottom. If the cistern is full, then the time that the leak will take to empty it is:

A cistern can be filled in 9 hours but it takes 10 hours due to a leak

1.	A cistern can be filled in 9 hours but it takes 10 hours due to a leak in its bottom. If the cistern is full, then the time that the leak will take to empty it is:
A.	60 hr
B.	50 hr
C.	80 hr
D.	90 hr
Answer» E.

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A cistern can be filled in 9 hours but it takes 10 hours due to a leak in its bottom. If the cistern is full, then the time that the leak will take to empty it is:

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