GMAT Quantitative Reasoning Practice Test 7

Question : 67 of 100

Marks: +1, -0

How many days will it take two windows cleaners to clean the entire 30 stories building?
(1) The first window cleaner can clean 15 windows in 10 minutes.
(2) The second window cleaner can clean twice as much as the first cleaner in 15 minutes.

Statement (1) BY ITSELF is sufficient to answer the question, but statement (2) by itself is not.
Statement (2) BY ITSELF is sufficient to answer the question, but statement (1) by itself is not.
Statements (1) and (2) TAKEN TOGETHER are sufficient to answer the question, even though NEITHER statement BY ITSELF is sufficient.
Either statement BY ITSELF is sufficient to answer the question.
Statements (1) and (2) TAKEN TOGETHER are NOT sufficient to answer the question, requiring more data pertaining to the problem.

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