Question 529921
We could solve this using algebra:

Let the speed of faster train be x
Then the speed of the slower train be x-10

{{{5x+5(x-10)=290}}} ---5x represents the distance traveled by the faster train, then 5(x-10) represents the distance traveled by the slower train, so the two distance equals 290 because they were once 290 miles away from each other
{{{5x+5x-50=290}}}
{{{10x=340}}}
{{{x=34(mph)}}} ---The mph here represents 'Miles per hour'

 The speed of the slower train
=34-10
=24(mph)