Question 702452
Try organizing the information as a table instead of a graph.  A picture or a graph can still help to see the situation and label parts.


An attempt at a picture:
Let William's speed be r.  John goes at r+20.


John,<---------------------------||--------------->,William

speed: r+20
time: 4 hours
distance: 4(r+20)
________________________________________________For William,
_________________________________________________speed: r
_________________________________________________time: 4 hours, same as John
__________________________________________________distance: 4r



After 4 hours, John and William are 250 miles apart.
Sum of distances from their home is 250 miles.


Equation for the solution,  {{{4*(r+20)+4*r=250}}}