Given data
The length of the major axis(l) of the ellipse is
The length of the minor axis of the ellipse is
The formula for the length of the major axis is,
The formula for the length of the minor axis is
Solving for a
We are told to look for how far apart are the vertices of the hyperbola.
The formula to solve for the distances between the vertices of the hyperbola is given as,
which is equal to the length of the major axis.
Hence, the distances between the vertices of the hyperbola is