# Two pipes can separately fill a tank in 10 hours and 40 hours respectively. Both the pipes are opened together to fill the tank, but when the tank is half-filled a leakage develops, through which $1\over2$ of the water supplied by both the pipes leaks out. What is the total time taken to fill the tank?

 [ A ]    8 hours [ B ]    10 hours [ C ]    12 hours [ D ]    16 hours [ E ]    18 hours
 Answer : Option C Explanation :