Question 448863
a^2+b^2=13^2
a=b+7 [b is the slower car.]
(b+7)^2+b^2=169
b^2+14b+49+b^2=169
2b^2+14b-120=0
b^2+7b-60=0
(b+12)(b-5)=0
b=5 mi, a=12 mi
.
Ed