Question 947350
g, the rate going.
r, the rate returning.
d, the one-way distance.
Uniform Rates of Travel, RT=D, variables infer-able.


_______________rate____________time______________distance
GOING___________g________________9_______________d
RETRNG__________r________________4_______________d
Average________40
Total___________________________13______________2d


Average rate should be total distance divided by total time.
{{{highlight((2d)/13=40)}}}


{{{d/13=20}}}
{{{highlight(d=260)}}}