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1. |
How long will it take for two pipes A and B to fill an empty cistern if they worked alternately for an hour each ?_x005F_x000D_ A. Working alone, Pipe A can fill the cistern in 40 hoursB. Pipe B is one third as efficient as Pipe A |
A. | Only A is sufficient |
B. | Only B is sufficient |
C. | Both (A) and (B) are sufficient |
D. | None |
Answer» D. None | |