Question

Question number 10 what do u have to do

Answer 1

Find the distance between the 2 trains when they r same distance from station

Answer 2

Train A: d = 40t + 400
Train B: d = 80t + 200

If you do a subtraction, you get it in terms of t only: 0 = -40t +200
Which allows you to sold for t:
40t = 200
t = 5 hours

And from there you solve for d = 80(5) + 200 = 600 miles