Find the shortest distance between the two skew lines

[frozen7]

Find the shortest distance between the two skew lines L(1) and L(2) with equations
r = (1, 2, 2) + s (4, 3, 2) and r = (1, 0, -3) + t (4, -6, -1)

How to do this? Help needed..

 

[siddharth]

Have you got any ideas on how you can approach this? Your book might have a few examples.

 

[frozen7]

I have an idea but I am not sure it is correct or not.
Is the length equal to the length of the normal of either of the line to the point of another line?

 

[benorin]

The lines point in the direction(s) of what vector(s)?