Answer:
Stacey is 16 miles far from the beginning of the trail.
Explanation:
Given:
Stacey's total hike journey to NCT, Colorado = 18 miles
Distance covered by her to, a resting spot = 4 miles
We have to find:
How far from the beginning of the trail is Stacey 
 hours after leaving the resting spot.
According to the question.
Distance remaining = 
 miles
Time taken = 
 hours Speed maintained = 
 mph
After leaving the resting spot she has covered a distance :
⇒ 

⇒ 

⇒ 
 miles.
In 
 hours she has covered 
 miles and also she has covered 
 miles before stopping here.
From the beginning she has covered :
⇒ 

⇒ 
 miles.
Stacey is 16 miles far from the beginning of the trail.