Question 785523
Let X = # of miles of local road, according to the statement an equation can be written as: X + 3 = 45 * (X/36 - 5/60). Note that 5 minutes are converted to 5/60 hours in order to match the unit mph (miles per hour).
Solve for X, get X = 27 miles. So the highway trip is 30 (=27 +3) miles long.