$v_{Joe} (2.5+2)+v_{JoAnn} 2.5=36$
$v_{Joe} (3)+v_{JoAnn} (2+3)=36$
So we have two equations:
$v_{Joe} 4.5+v_{JoAnn} 2.5=36$
$v_{Joe} 3+v_{JoAnn} 5=36$
Now I don't think there is a problem to solve it. Try it yourself.
$v_{Joe} (2.5+2)+v_{JoAnn} 2.5=36$
$v_{Joe} (3)+v_{JoAnn} (2+3)=36$
So we have two equations:
$v_{Joe} 4.5+v_{JoAnn} 2.5=36$
$v_{Joe} 3+v_{JoAnn} 5=36$
Now I don't think there is a problem to solve it. Try it yourself.