1.

 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.
Answer» B. 31 hrs.


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