Question 898520
The sum of their distances for 2 hours was 11 miles.


RT=D and you have two of these terms for RT.


r = one of their speeds;

{{{r*2+(r+0.5)*2=11}}}
You know what to do.


Solution steps could vary, but one might choose:
{{{2(r+(r+1/2))=11}}}
{{{2(r+r+1/2)=11}}}
{{{2(2r+1/2)=11}}}
Continue this until finished........