Verified Answer :

\(1h=60min\\\\\\84\ mi/h=84\ \frac{mi}{60min}=\boxed{1.4\ mi/min}\leftarrow rate\\\\1.4\ mi/min\times2min=\boxed{2.8\ mi}\leftarrow distance\)

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AL2006

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
 

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