Astronomically, the problem makes no sense,
. . but I'll solve it anyway.
Earth and Mars intersect each other.
(a) Find a parametric equation of the line in which Earth intersect Mars.
Add  and : .
Substitute into : .
. . We have: .
On the right, replace with the parameter
. . Therefore: .
A strange (silly!) question . . .(b) The coordinates of Spring Lake is given by the point (-5, 10, 13).
How far away from Spring Lake is the line mentioned in (a)?
Spring Lake could be a ski resort located on Mars or Jupiter or . . .
Ignoring that possibility, Spring Lake is probably located on Earth,
. . in which case, it is on the line mentioned in (a).
. . The distance is zero.
To check, try