25 (you have to solve both part a and part b) part a: my friend sets out walking at a speed of 3 miles per hour. i set out behind her 5 minutes later at 4 miles per hour. when i start walking, how many miles has my friend traveled? part b: my friend sets out walking at a speed of 3 miles per hour. i set out behind her 5 minutes later at 4 miles per hour. for how many minutes will my friend have been walking when i catch up to her?

Part A:

60/3= 20

You travel 1 mile every 20 minutes.

So, 5 minutes is 1/4 of 20.

Your friend walked 1/4 of a mile.

Part B:

You already know that your friend was 1/4 mile ahead of you.

She will continue to walk at the same rate.

You will walk:

6/4= 15

1 mile every 15 minutes.

Every 5 minutes, you walk a 1/3 of a mile.

(this is distance walking every 5 minutes)
Friend/ You

1/4 0

2/4 1/3

3/4 2/3

4/4 3/3

4/4= 1 and 3/3

Your friend will have walked 20 minutes before you caught up with her.

I hope this helps!
~kaikers