Answer:
He will walk 11.25 miles in 2.5 hours
Explanation:
Consider the provided information.
A speed walker covered 6 3/4 mi in 1 1/2 hour.

This can be written as:

Multiply both the sides by 2/3.


We need to find how far will he walk with the same pace in 2.5 hours.
Multiply both the sides by 2.5


Hence, he will walk 11.25 miles in 2.5 hours