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 right
[ D ]    16 hours
[ E ]    18 hours
Answer : Option C
Explanation :
500
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