Question 900233
RT=D basic rule for uniform travel rates.


x time done at 55 mph, y time done at 75 mph.
{{{x+y=5}}};


RT means distance.
{{{highlight_green(55x+75y=340)}}} and again, {{{highlight_green(x+y=5)}}}.
Simplify the distance sum equation:  {{{11x+15y=68}}}.


Any method you want, solve this system:
{{{highlight(system(11x+15y=68,x+y=5))}}}.