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题库 / Prep2007E2-DS-204
If Mary always takes the same route to work, how long did it take Mary to get to work on Friday?
(1) It took Mary 20 minutes to get to work on Thursday.
(2) Mary's average speed on her trip to work was 25 percent greater on Thursday than it was on Friday.
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
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我觉得用“RTD”模型=曼哈顿=大脑不易死机
R T D
周三 1 20’ D
周五 0.75 x D
20=0.75x ，（1）+（2）充分
假设距离为D， 已知周四的时间 Tthu=20， 可得周四速度Vthu=D／20.
Vfri=D/20*（1+25%）=D/16
Tfri=D／（D／16）=16