Answer:
It will take 22.5 minutes to complete 1 mile
Explanation:
From the question,
The marching band walks 1/15 miles in 1.5 minutes
First we will determine the miles cover in 1 minute
If the marching band walks 1/15 miles in 1.5 minutes
then, they will cover
miles in 1 minute

Then,

miles
∴ 2/45 miles are covered in 1 minute
Now,
If 2/45 miles are covered in 1 minute
Then, 1 mile will be covered in
minute


∴

Hence, it will take 22.5 minutes to complete 1 mile