<PRE><B>Question 976403</B>
Let one of the trains have the speed of r.
RT=D is how rate, time, distance are related for uniform travel rates.


__________________rate___________time_________distance
__________________r______________4_____________(____)
__________________r+12___________4_____________(____)
Total__________________________________________440


Fill the missing cells, form the necessary equation, and solve.</PRE>