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Three copiers , , and , working simultaneously and independently at their respective constant rates, can copy a certain document in 6 minutes. How long does it take Copier Z, working alone at its constant rate, to copy the document?

(1) Copiers and , working simultaneously and independently at their respective constant rates, can copy the document in 12 minutes.

(2) Copiers and , working simultaneously and independently at their respective constant rates, can copy the document in 9 minutes.

  • AStatement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
  • BStatement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
  • CBOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
  • DEACH statement ALONE is sufficient.
  • EStatements (1) and (2) TOGETHER are not sufficient.
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正确答案: A

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