Question 745344
{{{x^2+(x+3)^2=15^2}}}

{{{x^2+x^2+6x+9=225}}}

{{{2x^2+6x-216}}}

divide by 2...

{{{x^2+3x-108}}}

{{{(x-9)(x+12)=0}}}


so the slower is 9 km an hour

and the faster is 12 km per hour