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题库 / OG2017Q-DS-212
During a certain bicycle ride, was Sherry's average speed faster than 24 kilometers per hour?
(1 kilometer = 1,000 meters)
(1) Sherry's average speed during the bicycle ride was faster than 7 meters per second.
(2) Sherry's average speed during the bicycle ride was slower than 8 meters per second.
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.
题目分析：
此题需计算骑行的平均时速，判断是否大于24km/h，需要进行单位转换。
（1） 平均速度大于7m/s，即大于0.007km/(1/3600)h=25.2km/h，大于24km/h，题目得解。
（2） 条件2给出的是小于某个速度，不能得到其是否大于24km/h。
因此，本题答案为（A），仅条件1可以解题，条件2不行。