求问og上的一道题目

imddung

after driving to a riverfront parking lot, Bob plans to run south along the river, turn around, and return to the parking lot, runnning north along the same path. After running 3.25 miles south, he decides to run for only 50 minutes more. If Bob runs at a constant rate of 8 minutes per mile, how many miles father south can he run and still be able to return to the parking lot in 50 minutes?
a. 1.5
b.   2.25
c.  3.0
d.  3.25
e. 4.75

我觉得我读不大懂题目。

imddung

谢谢。可是我还是不大懂。可以劳烦你翻译一遍题目吗？我不大清楚Bob究竟是怎么走的路线。

imddung

明白了。十分感谢你。