Answer:
The equation that best models this situation is :
b. 
Distance traveled by Train W = 1600 miles
Distance traveled by Train Z = 2,000 miles
Step-by-step explanation:
Given:
Time taken for Train W to complete a trip = 20 hours
Time taken for Train Z to complete a trip = 25 hours
The city Train Z is traveling to is 400 miles farther away than the city Train W is traveling to.
both trains have same speeds and start from same location.
To find the distance in total each train travels.
Solution:
<em>Let length of the trip of Train W be </em>=
miles
Speed of Train W can be given as :
⇒ 
⇒ 
<em>So, the length of the trip of Train Z will be</em> =
miles
Speed of Train Z can be given as :
⇒ 
⇒ 
Since the speeds are same, so the equation to find
can be given as:
⇒ 
Solving for 
Multiplying both sides by 100 to remove fractions.
⇒ 
⇒ 
Using distribution.
⇒ 
Subtracting both sides by 
⇒ 
⇒ 
Thus, Distance traveled by Train W = 1600 miles
Distance traveled by Train Z =
= 2,000 miles