Question 878772
R*T=D, rate unit is meters per second.


Let t = time that Randy runs, which is 10 seconds less than the time Chris runs.  Chris going slower, needs less time than than Randy.


d is some unknown distance which Chris and Randy each run.


________________speed_______time______distance
Chris___________8___________t+10______8(t+10)
Randy___________10___________t________10t


Again, their distances are equal when Randy meets Chris.
{{{highlight_green(8(t+10)=10t)}}};
Solve for t, time in seconds.