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题库 / Prep2007E1-DS-155
Did it take Pei more than 2 hours to walk a distance of 10 miles along a certain trail? (1 mile = 1.6 kilometers, rounded to the nearest tenth.)
(1) Pei walked this distance at an average rate of less than 6.4 kilometers per hour.
(2) On average, it took Pei more than 9 minutes per kilometer to walk this distance.
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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一共要走10 miles = 16 kilometers
(1)average rate < 6.4k/h
当rate = 6.4k/h时，total time cost = (16/6.4)h > 2h. 当rate < 6.4, 16/6.4增大，只会比2h更长时间
(2)>9min/k
一共16k，当=9min/k时，总耗时9min*16k=135min > 2h, 当数值增大，总耗时增大，超过2h
额，只是小小更正一下，9* 16 = 144.。。
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