Question 844341
Either train overtaking the other means they travel in the same direction, either parallel or on same path.


TRAIN___________speed_______time(not as points)_____distance
A, slow__________r___________7______________________r*7
B, fast________r+160_________2______________________(r+160)*2


Distinguish between time points on a number line, and quantities of time between points on a number line.  The time column shows time increments according to the described information.


The fast train overtakes the slow train when {{{highlight(r*7=(r+160)*2)}}}.
Solve for r.