Machine A is three times more efficient than machine B. How long does it take A and B to work together at the same time for 3000 pieces of work?
1: Machine B can produce 1000 goods per hour.
2: Machine a produces 2000 more pieces per hour than machine B.
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AStatement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
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BStatement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
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CBoth statements TOGETHER are sufficient, but NEITHER one ALONE is sufficient.
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DEACH statement ALONE is sufficient.
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EStatements (1) and (2) TOGETHER are NOT sufficient.
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正确答案: D