<PRE><B>Question 831226</B>
r is speed of slow train


__________________speed___________time____________distance
Fast______________r+5_____________10______________(___)
Slow_______________r______________10______________(___)
Total_____________________________________________850


Knowing the essential R*T=D for Rate, Time, Distance, you should see what and how to fill in, and what equation to make and solve for r.</PRE>