Answer
The distance traveled is 20 miles.
Work Step by Step
This is the formula we will use to relate distance d, rate r, and time t.
$d=rt$
Since we are given a rate in miles per hour, we must convert the time to hours.
$15$ min = $0.25$ hrs
Plug in the information to the distance formula.
$d=80\frac{mi}{hr}*0.25hr$
Multiply.
$d=20mi$