要考试了，问一道prep里的数学！

huangsiyan

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

(A) 6又2/3
(B) 15
(C) 20
(D) 25
(E) 26又2/3

huangsiyan

哎，还是语法不好啊.............

lenghongmin

楼上正解。如果是等了五分钟应该是wait for 5 minutes。如果是wait for sb+时间，时间是指一个时间状语，表示一个时间点，而不是时间段

zhangluE

而不是说等了5分钟

zhangluE

“Thecyclist stops to wait for the hiker 5 minutes after passing her ”                         要点是这一句！wait for the hiker 5 minutes after passing her 的意思是在pass her 5分钟后开始等hiker

huangsiyan

答案是c

我看不太懂题目，能解释一下吗？谢谢~

zm_patrickS

(20-4)*5/60=距离
距离/4=1/3小时=20minutes

michael_wind

是D吗？