Answer:
Distance covered by Eli is
miles.
Explanation:
Eli biked the distance from his home initially =
miles
Then he remembered that he had left a book at home.
He came back home and traveled the distance =
miles
Then he reached the library by traveling the distance =
miles
Total distance covered by him =

=

= 5 +

=

=

=
miles
Therefore, distance covered by Eli is
miles.