Question 835094
One walks r mph, and the other walks r+0.5 mph.
12 minutes = 1/6 hour.


Rate that they approach is {{{r+r+0.5=2r+0.5}}} mph.


{{{(2r+0.5)(1/6)=0.7}}} according to {{{R*T=D}}};
{{{2r+0.5=0.7*6}}}
{{{2r=0.7*6-0.5}}}
{{{2r=4.2-0.5}}}
{{{2r=3.8}}}
{{{highlight(r=1.9)}}} mph
The faster walker goes at {{{highlight(2.4)}}} mph