Answer
You can travel $25$ miles from the airport by taxi with $27.50$ as your budget.
Work Step by Step
Budget = $27.50$
Charges:
Tolls = $4.50$
Taxi Cost = $3$
$= 27.50 - 4.50 - 3$
$=20$
Charge per mile $= 0.8$
$=20\div0.8$
$25$ miles
Therefore you can drive 25 miles from the airport with a budget of $27.50$