Question 453158
You could solve this a few different ways the most simple of wich would be to set up an equation with a variable (x) representing time, in hours, connected to the speeds and where the sum of the two speeds equals 456 so:

{{{105x + 85x=456}}

{{{190x = 456}}}

{{{x=(456/190)}}}

{{{x=2.4}}}
 It would take 2 hours and 24 minutes for the trains to meet.