Question 919977
r rate of the slower bus
(r+15)3 + 3r = 345
6r= 300
r = {{{ highlight_green(50mph)}}} , rate of the slower bus.  Faster bus is {{{ highlight_green(65mph)}}}  {{{50+15}}}
and...checking
65mph(3hr) + 5mph(3hr) = 195mi + 150mi =  345mi