Bob runs 6 miles per hour. His friend Jim runs at 9 miles per hour. If Bob has a 1 mile head-start, how many minutes will it take before Jim catches him?
Let's be accurate as possible. Think before you answer.
20
Bob runs.

1 miles per minute because 6 / 60 =.

1.

Jim run at.

15 miles per minute 9 / 60 =.

15.

We know that.

1(Number of Minutes) + 1 =.

15(Number of Minutes).

Therefore 1 =.

05(Number of minutes).

Therefore (Number of minutes) = 20 because 1 /.

05 = 20.

.

The answer: 20