A cistern is normally filled in 2 hrs,but takes 2 hrs longer to fill because of a leak on its bottom,if Cistern is full ,how much time citern would empty?  Choose the correct answer
A) 4 hours  B) 20 hours  C) 30 hours  D) 40 hours  E) 50 hours
If leakage/hour=1/x, then 1/2 -1/x= 1/4, solving 1/x=1/4   So in 4 hours full cistern will be empty.   4 hoursNSWER:4 hours
<result>A</result>
A cistern is normally filled in 2 hrs,but takes 2 hrs longer to fill because of a leak on its bottom,if Cistern is full ,how much time citern would empty?