Question 966615
RT=D basic rule


___________________rate___________time___________distance
UUPP_______________r-c____________u______________d
DOWN_______________r+c____________b______________d
Total_____________________________t


r,u,b, are unknown.


c=5
t=1+4/5
d=40


Make the system of three equations.


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You might make the system smaller near the start if you first use the time sum equation:  {{{b+u=t}}}, and then
{{{u=t-b}}}, and you then will have this system:


{{{system((r-c)(t-b)=d,(r+c)b=d)}}};
and the unknown variables are r and b.