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

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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 lead will take to empty is ?
A.	60 hrs
B.	70 hrs
C.	80 hrs
D.	90 hrs
Answer» E.

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