Thanks Racefan
I came up with this, Works the same.

A=runner one $10 to win
B=saver odds 3.5
C=saver odds 4.8

B=(C*A)/((B-1)*(C-1)-1)

=48 / 2.5 * 3.8 -1
=48 / 8.5
B= $5.6
So do the same for C saver and that should =$4.1

$10 win on A
$5.6 on B saver
$4.1 on C saver
Return B = $19.6
Return C = $19.6
If either B,C wins they cover each other and also covers A at $9.9
Almost at Ten dollars close enough for me.

GD4TH