【GMAT考满分数据洞察DS题库】Machines M _真题_答案

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Machines $M_{1}$ and $M_{2}$ purify air at different constant rates. Machine $M_{1}$ , operating alone for 5 hours, purified the air within part of one floor of a building; then Machine $M_{2}$ , operating alone for 4 hours, purified the air within the rest of the floor. How many hours would it have taken Machine $M_{1}$ operating alone to purify the air in the entire floor?

$M_{2}$ purified one cubic foot of air per minute.
$M_{1}$ purified fifty percent more air in 5 hours than $M_{2}$ purified in 4 hours.

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: B

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