A cistern can be filled in 10 hours but due to a leak, it takes two more hours for the cistern to get filled. What is the time taken by the leak to empty a full cistern?

A cistern can be filled in 10 hours but due to a leak, it takes two mo

1.	A cistern can be filled in 10 hours but due to a leak, it takes two more hours for the cistern to get filled. What is the time taken by the leak to empty a full cistern?
A.	40 hours
B.	50 hours
C.	60 hours
D.	30 hours
Answer» D. 30 hours

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A cistern can be filled in 10 hours but due to a leak, it takes two more hours for the cistern to get filled. What is the time taken by the leak to empty a full cistern?

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