Selam N. answered • 03/17/18

Tutor

5
(6)
Mathematics Teacher

Hi,

distance=speed(time)

Let, t be the time it took for Karen to catch up with Renee;

Karen: d= 28t

Renee: d= 20(2 +t). Renee has already travelled for two hours.

The distance they travelled will be equal, when Karen catches up with Renee, so set the equations equal to each othe,

28t = 20(2 + t)

28t = 40 + 20t

8t = 40

t = 5

The answer is

**after 5 hours.**