Question 168377
call speed of the east bound r+12
.....speed of the west bound r
distance of the west bound d
and distance of the east bound 336-d

(r+12)2=d.....eq 1  or 2r+24=d
r(2)=336-d....eq 2....now add the equations together to eliminate the d terms

4r=312

{{{highlight(r=78)}}} speed of the west bound
{{{highlight(r+12=78+12=90)}}} speed of the east bound