1.

Pipes A and B, when working together, can fill an empty tank in 8 hours. If B is stopped after 2 hours, it will take a total of 11 hrs to fill the tank. How long would it take A to fill the empty tank alone?_x005F_x000D_

A. 15 hrs
B. 12 hrs
C. 13 hrs
D. 16 hrs
Answer» C. 13 hrs


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