Question 746437
Call the faster cars rate V, then the slower car travels V-15 km/hr


together they travel 2V-15 km/hr

so...


{{{

2V-15 = 230/2

}}}


{{{
2V-15+15-115+15
}}}

and simplifying we get V=65 km/hr

(and so the slower car travels 50 km/hr)


:)