Question 1076121
MILES and MINUTES


{{{system(r-b=1/20,r+b=9/20)}}}


Add those to find r.
Subtraction those to find b.


{{{2r=(1+9)/20}}}

{{{2r=10/20=1/2}}}

{{{r=1/4}}}-----------------Reed runs 1 mile in 4 minutes.