Question

大客车与小客车同时从A市出发到B市,客车每小时行驶90千米,小汽车第一小时行驶60千米，以后每小时增加5千米

大客车与小客车同时从A市出发到B市,客车每小时行驶90千米,小汽车第一小时行驶60千米，以后每小时增加5千米，小汽车需要（ ）小时追上客车？

要算式和解释。

Answer 1

(30/5)*2+1=13小时
解释，第一小时大客车比小汽车快30千米，因小汽车每小时增加5千米，那么到（30/5）+1=7小时时，两车速度相等，那么要再经过30/5=6小时时小客车的速度比大客车快30千米，故小汽车需要（ 13 ）小时追上客车

Answer 2

设X小时追上，此时：

客车行驶距离为：90X千米；

小客车行驶距离：60+(60+5)+（60+5*2)+。。。+（60+5*（X－1)）＝60X+5*（1+（X－1)）/2 ＝60X+2.5X*（X-1)

二者距离相等，所以：90X＝60X+2.5X*（X-1)
整理得：2.5（X-1)=30
解得：X＝13
即，13小时后追上。

Answer 3

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Wizards clearly recognize that, with McKee in exchange for rookie isn't worth - Wizards Mackey has been training for 3 a number of now finally emerging, offers to be a great center. Scarce in the current large league center environment, Mackey this talent is very rare. And the Wizards also think that even though only No. 6 pick, they certain can help the c's elected to some rookie. Minnesota isn't a secret you want to do business, they already have the previous games - Michael Beasley and Kevin - Lufkin. Place show preferred Derek - Williams,wholesale Oakley, although strong,wholesale sunglasses, but with slightly Minnesota repeat the current system, so following the workout, Minnesota touches on Ernest - Kantor can also be really interested.

Answer 4

(30/5)*2+1=13小时 解释，第一小时大客车比小汽车快30千米，因小汽车每小时增加5千米，那么到（30/5）+1=7小时时，两车速度相等，那么要再经过30/5=6小时时小客车的速度比大客车快30千米，故小汽车需要（ 13 ）小时追上客车

Answer 5

13个小时

用的最笨的方法