Answer:
[tex]\frac{37}{60}[/tex] or 0.62 of a mile that he will need to complete to reach his target.
Step-by-step explanation:
[tex]2 \frac{3}{4} + 3 \frac{1}{2} + 5 \frac{1}{3} + 2 \frac{4}{5} = \frac{863}{60} \\18-\frac{863}{60} = \frac{37}{60}/ 0.62[/tex]