雷哥网GMAT-【OG20-P292-436题】In planning for a car trip, Joan estimated both th_OG17新题

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【OG20-P292-436题】

In planning for a car trip, Joan estimated both the distance of the trip, in miles, and her average speed, in miles per hour. She accurately divided her estimated distance by her estimated average speed to obtain an estimate for the time, in hours, that the trip would take. Was her estimate within 0.5 hour of the actual time that the trip took?

(1) Joan’s estimate for the distance was within 5 miles of the actual distance.

(2) Joan’s estimate for her average speed was within 10 miles per hour of her actual average speed.

A

Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
分析A选项
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B

Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
分析B选项
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C

BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
分析C选项
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D

EACH statement ALONE is sufficient.
分析D选项
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E

Statements (1) and (2) TOGETHER are NOT sufficient.
分析E选项
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当前版本由 Helen 更新于2018-09-21 17:22:30 感谢由 Helen 对此题目的解答所做出的贡献。

题干：S=vt  is t<0.5 ?
条件1：S<5，v未知，不充分
条件2：v<10，S未知，不充分
1+2：不充分

题目讨论（2条评论）

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Cheryl

J预测了自己的路程和速度后，估计了自己的时间，问时间的估计和准确的时间之间是否差距在0.5小时以内？ 1：距离在实际距离的5miles以内，估计的d是在d-5到d+5之间，没说速度； 2:速度在实际速度的10miles/h以内，估计的v在v-10到v+10之间，没说距离； 1+2:时间最小值是(d-5)/(v+10),最大值是(d+5)/(v-10)，算出来是否在d/v的0.5以内不确定，所以E

9 1 回复 2021-08-24 16:58:52
贾思敏回复Cheryl

这个解析棒！啊，你应该提交解析的~

1 0 回复 2021-10-04 16:34:34

冲他丫的回复Cheryl

6看懂了

0 0 回复 2021-10-15 23:17:26
730以上

当5和10同时减小的时候并不知道5/10是大于还是小于0.5，所以是（1）和（2）together are not sufficient.

2 0 回复 2018-01-14 20:38:05