试题与答案

一辆汽车从A地出发按某一速度行驶,可在预定的时间到达B地,但在距B地180公里处意外

题型:单项选择题

题目:

一辆汽车从A地出发按某一速度行驶,可在预定的时间到达B地,但在距B地180公里处意外受阻30分钟,因此,继续行驶时,车速必须增加5公里,才能准时到达B地。则汽车后来的行驶速度是()。

A.40公里/小时

B.45公里/小时

C.50公里/小时

D.55公里/小时

答案:

参考答案:B

解析:设汽车在受阻前的正常行驶速度为x公里/小时,可以得到方程:180/x=180/(x+5)+0.5,其中180/x是汽车按照原来的速度跑完剩下的180公里所需要的时间,180/(x+5)是车速增加5公里后跑完180公里所需时间。解方程可得x=40,后来的速度应为45公里/小时,故正确答案为B选项。

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