再问一题哦

evelyn205205

A hiker walking at a constant rate of 4 miles per hour is passed by a cyclist traveling in the same direction along the same path at a constant rate of 20 miles per hour. The cyclist stops to wait for the hiker 5 minutes after passing her, while the hiker continues to walk at her constant rate. How many minutes must the cyclist wait until the hiker catches up ?

A. 6+2/3

B. 15

C. 20

D. 25

E. 26+2/3

ANSWER : 20。
各位牛牛，这道题什么思路啊，关键是没看懂。

evelyn205205

谢谢各位的帮助

evelyn205205

求帮助

Avengeryzc

路人4m/h,被自行车20m/h追了，车超过他5分钟后停下等路人；两个速度比为1:5，时间为5，那么相对速度就是4。   同样的距离，路人要花5倍的车人时间，因为路人一直在走，现在只要花4倍就好。   4*5=20

evelyn205205

啊。原来是没审题，我一直以为是路人一开始赶超了自行车，。。。然后就更加看不懂了。
anyway， thx very much