A tap can till an empty in 12 hours and a leakage can empty the whole tank in 20 hours. If the tap and the leakage are working simultaneously, how long will it take to fill the whole lank ?

 A tap can till an empty in 12 hours and a leakage can empty the whole tank in 20 hours. If the tap and the leakage are working simultaneously, how long will it take to fill the whole lank ?

A). 30 hrs.

B). 31 hrs.

C). 32 hrs.

D). 33 hrs.

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