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Khalil drove 120 kilometers in a certain amount of time. What was his average speed, in kilometers per hour, during this time?
(1)If Khalil had driven at an average speed that was 5 kilometers per hour faster, his driving time would have been reduced by 20 minutes.
(2)If Khalil had driven at an average speed that was 25% faster, his driving time would have been reduced by 20%.
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1,列一个关于时间的等式， 120/V=120/(V+5)+1/3, 化简v^2+5v-1800=0,△>0,有解，充分
2，同上列等式，120/1.25v=120*0.8/v, 求不出来解，不充分
贾思敏
题干：K在某段时间内开车车开了120km。问他在那段时间的平均速度是多少？（km/h） (1)If Khalil had driven at an average speed that was 5 kilometers per hour faster, his driving time would have been reduced by 20 minutes. 条件一：K如果速度快了5km/h的话，他的时间就就会减少20min（也就是减少了1/3 hour） 用字母表达法啊丢：120/v=120/(v+5)+1/3，化简得：V^2+5V-1800=0, △=（5）^2-4*1*(-1800)>0, 反正就是一正一负根，因为速度是正数，答案唯一，充分。 (2)If Khalil had driven at an average speed that was 25% faster, his driving time would have been reduced by 20%. 120/1.25v=(120/v)*0.8 尼玛好家伙120/1.25v 化简之后就是(120/v)*(1/1.25)=（120/v）*0.8，就等于左边，尼玛永远等价，无法求出具体数值，不充分！搞这玩意阴我这GMAT害
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2021-11-02 15:07:10
面包大王
注意条件二列出来的等式两边是永远等价的 没法求出具体数值！
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2021-09-17 21:48:13
面包大王回复面包大王
我犯了跟楼上同样的错！TOBEAWESOME对不起！！！
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2021-09-17 21:48:54
茉莉小淘气
注意条件二列出来的等式两边是永远等价的 没法求出具体数值！！！！要算一下
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2021-07-14 00:25:35
茉莉小淘气回复茉莉小淘气
抱歉我想粘贴放在自己得笔记里的 结果粘贴错了，原作者对不起555
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2021-07-14 00:26:42
TOBEAWESOME
注意条件二列出来的等式两边是永远等价的 没法求出具体数值！
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2020-10-24 19:15:05
clark
v=40km/h,t=3h
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2019-10-17 20:33:53
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数据充分DS
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