Question 413915
  <pre><font face = "Times" size = 3 color = "indigo"><b>
Hi
Letting y represent constant rate of speed of the second train 
Question states***  Note:  D = r*t and distances the same for both trains
 4.5hr*x = 3.5hr*y
Solving for y
 4.5x/3.5 = y
  (9/7)x  = y