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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%.
分析A选项
分析B选项
分析C选项
分析D选项
分析E选项
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
183538xjbk
路程就是120 kilometers
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
933283df回复 贾思敏
hhhhhhhh
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2022-11-06 16:52:58
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!
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
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!
clark
v=40km/h,t=3h
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