Question 925529
_________________speed__________time_________distance
GOING____________r+25_____________4__________d=(r+25)4
RETRG_____________r_______________6__________d=r*6
Total____________________________10_________2d=(r+25)4+r*6


You also have two formulas for d.
{{{highlight_green((r+25)*4=r*6)}}}
{{{2(r+25)=3r}}}
{{{2r+50=3r}}}
{{{highlight(highlight(50=r))}}}------the RETURNING trip.


The GOING trip was 75 kilom per hour.