Question 1058886
Time after 1:00 p.m. is x.
<s>Their distances form a right triangle, so using Pythagorean Theorem formula for the distances:


{{{cross((2.5x)^2+(5x)^2=10^2)}}}</s>


You are right.  I misread the description.  They went in OPPOSITE directions.


You want this:
{{{2.5x+5x=10}}}