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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. | |