Every

mile, there is a place to rest
The trail is

miles long
Change the length of the trail into an improper fraction

| which you get by multiplying the 1 and three then add the to and place it over three
Now you divide the length of the trail by the length of the places for breaks

÷

|flip flop the second fraction then multiply

=

Now divide the numerator (to) by the denominator (bottom)
15÷3=5
Answer:There are five places to rest along the trail