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Inlet pipes 'A' and 'B' can fill a tank in 24 minutes and 40 minutes, respectively. Both the pipes are opened together to fill the tank. When the tank is filled up to half of its capacity, a leak develops through which (1/4)th of the water supplied by both pipes goes out. Find the total time (in minutes) taken to fill the tank now.

A 18.5

B 19

C 17.5

D 16.5

E None of these

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