If Bob, working alone, can paint a certain room in 3 hours, how long does it take Bob and Richard working together to paint the room?
(1) Richard, working alone, can paint the room in 2 hours.
(2) Richard paints at a constant rate that is 50% greater than the rate at which Bob paints.
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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