Me what is the rate and what is the distance traveled in 2 minutes? ?

In the question, they GIVE you the rate, but they want you to change its units,
from per-hour to per-minute.

When you want to change units of something, multiply it by a fraction that has
the same number on top and bottom but in different units. 
Here. Watch closely:

(84 mile/hour) x (1 hour / 60 minutes) = 84/60 = 1.4 mile/minute

In 2  minutes, the car travels  (2 x 1.4) = 2.8 miles
 

Wow. that is a really cool question.