Question 961874
RT=D rate time distance;



___________________speed__________time__________distance
WALK________________r______________4____________d
BIKE_______________r+6_____________1____________d



The solution from here requires only one single equation.  Based on the related information and the actual question, you can redo the data table as this instead:


___________________speed__________time__________distance
WALK________________r-6___________4_____________d
BIKE________________r_____________1_____________d


Still, you only need one equation.
{{{(r-6)*4=r*1}}}